i86 DISCOVERY REPORTS 



figs. 35-7) is the usual representative of the species, but at Sts. 387 and WS 468 a com- 

 plete series connecting that with the normal thin-walled type was seen. Of two speci- 

 mens found at St. WS 517 one was the thick- walled form and the other specimen was 

 thin-walled, perhaps pelagic. At St. 385 an abnormal specimen with a young individual 

 permanently attached to its test was found. It is similar in nature to the abnormal 

 Globigerinae described on p. 175. 



Genus Eponides, Montfort, 1808 



502. Eponides umbonatus (Reuss) (F 386) (SG 322). 



Ten stations: 383, 384, 385, 386; WS 204, 205, 403, 468, 469, 505. 



Common at Sts. 384, 385 and WS 403, and frequent at St. WS 204; rare or very rare 

 elsewhere. The thick- walled typical Rotalina umbonata only was found at Sts. 383, 384 

 and WS 403, the thin-walled Truncatulina tenera (see F 386) only at Sts. WS 469 and 

 505. At the remaining stations both forms were observed and transition stages could be 

 found. The stations are all in the deep water of the Scotia Sea, Drake Strait and Bellings- 

 hausen Sea, ranging between 1500 m. at St. WS 505 which is in the far south of the 

 Bellingshausen Sea, near the ice barrier, to 4773 m. at St. 386 in the Drake Strait outside 

 the Antarctic convergence line. 



503. Eponides karsteni (Reuss) (F 391) (SG 324). 

 Six stations: 167, 180; WS 468, 469, 474, 483. 



Very rare everywhere. The stations are confined to the Scotia Sea, South Orkneys and 

 South Shetlands, the southern Hmit being at St. 180 in the Palmer Archipelago, where 

 the single specimen found was very small. 



504. Eponides exiguus (Brady) (F 387) (SG 323). 



Thirty-three stations: 175, 180, 190, 195, 203, 209, 363, 366, 384-7; 62° 57' S, 60° 20' 30" W; 

 WS 204, 205, 389, 392, 393, 395, 403, 468, 469, 476, 482, 486, 488, 495, 498, 503, 505, 506, 507 B, 

 516. 



Widely distributed, but reaching its maximum in size and frequency in two distinct 



areas, the deep water of the Scotia Sea and Drake Strait, and in the Bellingshausen Sea. 



It is very common at St. WS 403 and common at St. 385; frequent at Sts. 384, 386, 



WS 204 and 205, all of which are deep-water stations in the first area. It is also common 



at Sts. WS 505, 506 in the second or Bellingshausen Sea area, where the specimens 



attain an unusual size for the species. The depths at these two stations are less, 1500- 



584 m. At most of the remaining stations, many of which are in quite shallow water, the 



species is rare and the specimens small. 



505. Eponides tumidulus (Brady) (F 366) (SG 312). 



Twenty-four stations: 177, 363, 384-6; WS 204, 205, 393, 395, 399, 403, 468, 472, 482, 495, 498, 



503. 505. 506, 507 A, 507B, 51 I> 513. 517- 



Common at Sts. 384, 385, WS 403, 506, 507A and 507B and frequent at Sts. 386 and 

 WS 204; elsewhere very rare. The depths range between 100 and 4773 m., but the 

 majority are in deep or very deep water, and at the shallow-water stations the specimens 

 are often far from typical. There is even greater range in the height of the shell than is 



