BULIMINIDAE 133 



275. Bolivina robusta, Brady (F 146) (SG 179). 

 One station: 180. 



Very rare but typical at 160 m. in the Palmer Archipelago. 



276. Bolivina compacta, Sidebottom (F 147). 

 One station : WS 482. 



Only a single specimen from 50 m. in the Bransfield Strait. 



277. Bolivina difformis (Williamson) (F 149) (SG 181). 

 One station: 386. 



A single typical specimen at St. 386 in the Drake Strait, at the exceptional depth of 

 4773 m. 



278. Bolivina malovensis, Heron-Allen and Earland (F 153) (SG 182). 

 Three stations: 385; WS 204, 205. 



Rare at St. WS 204 and very rare elsewhere. All the stations are in deep water, 

 3328-4207 m. 



279. Bolivina inflata, Heron-Allen and Earland (F 152). 

 One station : WS 482. 



A single specimen from 50 m. in the Bransfield Strait. 



280. Bolivina cincta, Heron-Allen and Earland (F 154) (SG 183). 

 Seven stations: 385, 386; WS 205, 468, 469, 505, 506. 



Common at St. WS 505, frequent at Sts. 386 and WS 506, very rare elsewhere. The 

 distribution is rather curious, as all the stations except WS 505 and 506 are outside, or 

 just within, the Antarctic convergence line, and in very deep water, over 3600 m. Sts. 

 WS 505, 506 are in the extreme south of the Belhngshausen Sea in depths of 1500 and 

 584 m. respectively. 



281. Bolivina decussata, Brady (SG 184). 

 Three stations: 385, 3S7; WS 505. 



A single typical specimen at each station. The two Discovery stations, 385 and 387, 

 are in the deep water of the Drake Strait, depth 3638 and 3102 m. respectively, and the 

 presence of a truly Pacific species there is not unexpected. But the third station, 

 WS 505, is one of the most southerly soundings received. It lies in the south of the 

 Bellingshausen Sea (70° 10' 30" S, 87° 46' W), and the presence of B. decussata may 

 perhaps be taken as evidence of the influence of a Pacific current extending into this 

 truly Antarctic area. 



Sub-family CASSIDULININAE 



Genus Pseudobulimina, gen.n. 



Test free, hyaline, consisting of two series of chambers of very different dimensions, 

 rapidly increasing in size and arranged side by side in a helicoid spiral of rather more 

 than one convolution. For convenience of description the outer large series will be 

 called A, and the inner smaller series B. On the dorsal side, or viewed from one edge. 



