124 DISCOVERY REPORTS 



256. Bulimina elongata, d'Orbigny. 



Bulimina elongata, d'Orbigny, 1846, FFV, p. 187, pi. xi, figs. 19, 20. 

 Bulimina elongata, Brady, 1884, FC, p. 401, pi. li, fig. i. 



Three stations: 181, 196, 385. 



Very rare at St. 181 in the Palmer Archipelago, depth 160-335 "^- ^ single typical 

 specimen at St. 196 in the South Shetlands, depth 720 m. At the remaining station, 

 385, which is in the Drake Strait, depth 3638 m., a few very small hyaline specimens 

 were found. 



257. Bulimina marginata, d'Orbigny (F 129) (SG 168). 



Eight stations: 180, 202; 64° 56' S, 64° 43' W; WS 496, 497, 507 a, 507B, 509. 



The records are confined to the Bellingshausen Sea and depths between 435 and 63 1 m. 

 It is frequent at Sts. WS 496, 497, 507 A and 507 B, and most typical at the last two 

 of these stations. Elsewhere, specimens are usually weak in the development of the 

 marginal cusps. 



258. Bulimina patagonica, d'Orbigny (F 130) (SG 169). 



Seventeen stations: 175, 177, 181, 186, 187, 194, 196; 64° 56' S, 64°43'W; WS 383, 480, 483, 

 494A, 498, 511-14. 



Confined to the South Shetlands, Bransfield Strait, Palmer Archipelago and Bellings- 

 hausen Sea. The only station where it is common is St. WS 511, where the specimens 

 are rather weak. At Sts. 177, 181, 186 it is frequent and the specimens are large, with a 

 tendency to run into B. aculeata. The first of these stations is in the Bransfield Strait, 

 1080 m., the others are in the Palmer Archipelago, 160-295 m. At most other stations 

 the specimens are small and weak, though single large individuals were found at Sts. 

 175, 196 and WS 494A. 



259. Bulimina aculeata, d'Orbigny (F 131) (SG 170). 



Twenty-one stations: 180, 181, 196, 202, 203, 369, 386; WS 494A, 496-8, 505, 506, 507 A, 507B, 

 509-14. 



Common at Sts. WS 506, 507A, 507B; frequent at Sts. 181, 369, WS 496, 497, 498, 

 505, 511 and 512 ; rare or very rare elsewhere. The distribution is confined to the South 

 Shetlands, Bransfield Strait, Palmer Archipelago and Bellingshausen Sea with the ex- 

 ception of two records. It is frequent at St. 369 in the South Sandwich Islands, 1767m., 

 and a single very small specimen was found at St. 386 in the Drake Strait, 4773 m. The 

 depth at this last station is also exceptional, as the species is generally most frequent 

 under 1000 m. The best specimens were found at St. 181 (160 m.) and at Sts. WS 506, 

 507 A and 507 B, all between 500 and 600 m. 



At many stations, even where frequent, the specimens are weak, the species being 

 feebly developed, and it is hard to discriminate between such specimens and B. 

 patagonica. At St. 369, where the species is frequent, the smaller specimens are typical, 

 but with increasing size, the marginal spines decrease, or even disappear entirely, 

 leaving only the apical spine, which is often very large. 



