to be widely distributed throughout the Southern Hemisphere. Macrocypris tumida Brady, 1880 Shells of this species were taken at between 1,400 and 1,800 meters depth nearly due east of Brownsville. The species is also known from somewhat shallower depths off the Kerguelens (50 meters), New Zealand (357 meters), and the southern coast of Norway. Macrocypris maculata (Brady, 1866) Shells of this ostracod were recovered from depths of between 57 and 1,720 meters at a number of stations in the northwest region of the Gulf. This species has been reported from the West Indies, the Caribbean, and Ceylon. Macrocypris similis Brady, 1880 Shells were collected from bottom samples, at depths of 33 to 144 meters, taken off Galveston. Distribution includes the east coast of South America, Ascension Island (at a depth of 2901,235 meters), and the coast of Ceylon. Macrocypris africana Müller, 1908 Three females belonging to this species were collected in an otter trawl haul at depths of between 20 and 22 meters off the Tortugas. This ostracod was originally described from the coast of South Africa. Macrocypris schmitti Tressler, 1949 Eight females were taken from cracked-up rock in shallow water on the west side of Loggerhead Key, Tortugas. This species is unknown except from this region. Family NESIDEA Bairdia coronata Brady, 1870 This doubtful form was described from specimens obtained off Veracruz in 1870 by G. S. Brady. Nesidea ovata (Bosquet, 1853) Shells of this bottom-dwelling ostracod were found in bottom samples taken in 1,810 meters of water a little north of due east from Brownsville. It has been reported from South Africa. Nesidea victrix (Brady, 1869) Shells of this species were collected at various stations in the northwest portion of the Gulf by Rothwell at depths ranging from 190 to 2,395 meters. It has been reported from the West Indies, the Caribbean (off Colon), the coast of north Brazil, and the west coast of North Africa. Nesidea cushmani Tressler, 1949 Several females were collected at depths of from 4 to 22 meters off Tortugas. This is the sole record of this species at the present time. Nesidea amygdaloides (Brady, 1866) Brady reported this species from the Gulf of Mexico off Veracruz years ago. It is also known from the Australian coast, Cuba, Cocos Islands, New Caledonia, and the southern coast of Norway. Bythocypris bosquetiana (Brady, 1866) Species of this genus are bottom-dwelling. B. bosquetiana has been reported from the presence of shells at depths of 1,253 to 2,523 meters in the region east of Brownsville. Its distribution includes the West Indies, Atlantic Ocean, the Mediterranean, and Bass Straits (1,270 meters depth). Bythocypris compressa Brady, 1880 Shells of this species were taken at depths varying from 66 to 1,920 meters at various locations in the northwest portion of the Gulf from Brownsville, the Sigsbee Deep, and as far as the mouth of the Mississippi River. This species had previously been reported from the South Pacific. Family CYTHERIDAE Shells of this species, which is also bottomdwelling, were obtained at depths of between 108 and 1,372 meters south of Atchafalaya Bay. It is known from the coast of Norway and the Gulf of Biscay. Pseudocythere caudata Sars, 1866 This easily recognized and widely distributed ostracod was reported present (shells only) by Rothwell in samples taken at between 310 and 1,372 meters in the area south of Atchafalaya Bay. Its distribution includes the North Atlantic, Franz Joseph Land, coast of Norway, Mediterranean, the Kerguelens, and Prince Edward Island. Cytherura lineata Brady, 1867 Numerous shells of this bottom-dwelling species were collected at various stations throughout the northwest sector of the Gulf at depths ranging from 31 to 1,810 meters. This species had been reported only from the English coast previous to the present time. Cytheropteron alatum Sars, 1866 As their name implies, species of this genus have prominent wing-like lateral projections from the sides of the valves and are easily distinguishable for this reason. They are strictly bottom-dwelling forms. C. alatum shells were recovered from the bottom samples taken at depths between 31 and 1,920 meters at stations widely scattered throughout the whole northwest sector of the Gulf. Its known distribution includes the coast of England, Shetland Islands, the North Atlantic, coast of Norway, and at Funafuti. Cytheropteron mucronalatum Brady, 1880 Shells of this ostracod were collected in bottom samples at depths of between 174 and 3,431 meters at stations scattered over the northwest area of the Gulf. This species had previously been reported from the Pacific Ocean, between Japan and Patagonia, the Azores (2,515-3,748 meters), the North Atlantic, and between the Azores and the Bay of Biscay at 5,005 meters depth. Eucytherura complexa (Brady, 1867) Shells were recovered throughout most of the northwest portion of the Gulf between Brownsville and the mouth of the Mississippi River at depths varying from 42 to 1,400 meters. This ostracod had previously been known only from the English and Norwegian coasts, and the Mediterranean. Paradoxstoma ensiforme Brady, 1867 These fragile-shelled forms, with their characteristic high posterior valve margins and suctorial mouths, are bottom-dwelling animals usually found near the coast in fairly shallow water. In the Gulf region, Rothwell reported finding their shells along the coast between the Brazos River and Atchafalaya Bay at depths of 16 to 90 meters. This species had been reported previously from the coasts of Norway and England, the Bay of Biscay, and the Mediterranean. Paracytherois flexuosa (Brady, 1867) Although these ostracods somewhat resemble Paradoxstoma both in shape and in the presence of a suctorial mouth, Paracytherois may be dis tinguished from the other genus by the beak-like, rather than ring-formed shape of the mouth. Rothwell obtained specimens with body parts intact at 66 meters depth off Trinity Shoal near Atchafalaya Bay. Shells of this species were taken at a number of stations in the northwest sector at depths varying from 43 to 190 meters. P. flexuosa had previously been reported from the coast of Europe, the North Atlantic, and Franz Joseph Land. Xestoleberis minima (Brady, 1866) Members of this genus, like some other groups of ostracods, have a brood pouch in the posterior part of the body for the reception of ripe ova for further development. The species X. minima was recorded by Rothwell from a specimen which he obtained with intact body parts at a depth of 88 meters off Galveston. Shells of this species were also found at various stations in the northwest sector of the Gulf at depths ranging from 68 to 210 meters. The species was earlier reported by Brady from shallow water in the West Indies. Xestoleberis expansa Brady, 1880 Shells were found at many stations in the northwest sector of the Gulf at depths of from 150 to 3,246 meters. This ostracod had been reported previously from off the Rio de la Plata at a depth of 3,473 meters and from the Arabian Sea. Xestoleberis curta (Brady, 1866) Shells of this species were taken at depths of between 82 and 265 meters off the coast between Galveston and Atchafalaya Bay. It had been reported previously from many parts of the oceans in depths ranging up to 2,514 meters. Xestoleberis punctata Tressler, 1949 One female was collected in shallow water from the debris of cracked-up rock west of Loggerhead Key, Tortugas. It is unknown from other regions of the world at the present time. Loxoconcha avellana (Brady, 1866) Species belonging to this genus are easily recognized by the short, rhomboid shape of the shell. L. avellana shells were found at stations throughout the northwest sector of the Gulf at depths of from 20 to 387 meters. Its known distribution includes the West Indies, Australia, Pacific, and Indian Oceans. Loxoconcha elegans (Brady, 1870) Shells of this ostracod were collected at several stations between Matagorda and Atchafalaya Bays in comparatively shallow water at depths of from 16 to 82 meters. It had previously been reported from Cuba and the Straits of Magellan. Loxoconcha dorso-tuberculata (Brady, 1866) This ostracod was found at only one station in the northwest sector of the Gulf in 190 meters off Atchafalaya Bay. It is known from the West Indies from which it was originally described by Brady years ago and from Noumea in the New Caledonia group of islands. Eucythere declivis (Norman, 1865) This genus contains forms which have a characteristically shaped shell, being much higher anteriorly than posteriorly. E. declivis shells were found in widely scattered locations in the northwest sector of the Gulf at depths of between 40 and 1,920 meters. Its distribution includes the coast of Europe, the North Atlantic, and Franz Joseph Land. Krithe bartonensis (Jones, 1856) The genus Krithe includes species with thin, smooth, and pellucid shells which have a broad marginal zone containing conspicuous pore canals. They are all bottom-dwelling and have poor powers of locomotion. K. bartonensis shells were found all over the northwest sector as far as the extent of the Atlantis cruises and in depths varying from 40 to 3,367 meters. It is a widely distributed form, being known from the European coast, Norway, Bay of Biscay, Iceland, North Atlantic, and Fiji Islands, at depths down to 3,200 meters. Krithe tumida Brady, 1880 Shells of this species were collected at depths of from 197 to 3,630 meters in the northwest sector of the Gulf. This species had been reported previously from the North Atlantic, the region of the South Atlantic off the Rio de la Plata in 3,473 meters, and from Funafuti. Cythereis dictyon Brady, 1880 Species belonging to this large genus all have rough, uneven shells which are often beautifully sculptured or covered with projections or spines. 259534 0-54-29 C. dictyon shells were found at many stations over the entire northwest sector of the Gulf at depths ranging from 63 to 3,475 meters. It is widely distributed throughout the oceans, being known from such regions as the Kerguelen Islands, Table Bay, Indian Ocean, and New Zealand. In general, it seems to be confined between north latitude 38° and 52° south latitude and has been found at all depths from 87 to 5,080 meters. Cythereis echinata Sars, 1866 This easily recognized ostracod was reported from shells found at many localities in the northwest sector of the Gulf by Rothwell at depths of between 31 and 3,157 meters. It had been reported previously from the North Atlantic and the Norwegian coast. Cythereis erica (Brady, 1880) This species seems to be widely distributed over the northwest sector of the Gulf of Mexico at depths of from 25 to 3,230 meters. Its distribution includes the North Atlantic, the coast of Brazil (1,235 meters depth), and East Indies (915 meters depth), and off the Cape of Good Hope (2,624 meters). Cythereis margaritifera Müller, 1894 Shells of this species were collected at three stations along the coast from Brownsville to Galveston at comparatively shallow depths which ranged from 29 to 265 meters. It was previously reported from the Gulf of Naples. Cythereis pumicosa (Brady, 1870) This species was reported from the waters off Veracruz by Brady. It has also been reported from Turk Island, New Providence, and Cuba in the West Indies. Cythereis stolonifera (Brady, 1880) Shells from this species were collected at a number of stations throughout the northwest sector at depths of between 88 and 3,246 meters. It is known elsewhere only from South Africa (Simons Bay). Cythereis rastromarginata (Brady, 1880) This ostracod appears to be widely distributed over the whole northwest sector of the Gulf and was reported from shells by Rothwell at depths of from 150 to 1,902 meters at widely scattered stations. The world-wide distribution includes the Pacific Ocean, Bass Straits, East Indies, Honolulu, and the Indian Ocean. Cytherideis silicula (Brady, 1870) The shells of this genus are long and comparatively very low in height. C. silicula was collected with body parts intact at depths of 31, 37, and 40 meters by Rothwell off Galveston, and shells of this species were taken along the coast from the Brazos River to Atchafalaya Bay in comparatively shallow water (18 to 174 meters. depth). This species had previously been reported by Brady from off Veracruz. Cytheridea setipunctata Brady, 1869 Brady reported this somewhat doubtful ostracod from the waters off Veracruz. This is the only known record of its distribution. OSTRACODA REPORTED FROM ADJACENT REGIONS A number of species of ostracods have been reported from areas immediately adjacent to the Gulf of Mexico. Although these species have not as yet been recorded from the Gulf proper, a list is included for future reference. Caribbean Sea (Off Colon) The following species have been reported by Brady for the Colon-Panama region of the Caribbean Sea and have been included by Müller (1912) in his compendium of the Ostracoda : Paracypris pulchella (Brady, 1886). Cytherella pulchra Brady, 1866. West Indies Müller records the following species from the West Indies: Macrocypris tenuicauda Brady, 1870. Nesidea subdeltoidea (Sars, 1887). Nesidea longisetosa (Brady, 1902). |