GULF OF MEXICO 



435 



Loxoconcha ele^ans (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 re- 

 ported 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 char- 

 acteristically shaped shell, being much higher 

 anteriorly than posteriorly. E. declivis shells were 

 found in widely scattered locations in the north- 

 west 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 pre- 

 viously 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 

 sculptiu-ed or covered with projections or spines. 



259534 O— 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 north- 

 west 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 dis- 

 tribution 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 Miiller, 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 Brad}^ 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 



