LITUOLIDAE 87 



are in various stages of growth. A possible explanation of their occurrence in such 

 surroundings is that they are the remains of a brood of young individuals, formed by the 

 breaking up of the protoplasm of a microspheric parent which had settled on the frag- 

 ment of membrane. In the case of a few of the specimens which are favourably placed 

 it can be stated that they are megalospheric, and this is probably the case with all of 

 them. 



159. Haplophragmoides canariensis var. variabilis (Heron-Allen and Earland) (F 91). 

 Six stations: 170, 175, 177, 190; WS 482, 517. 



This wild-growing variety is common at St. 175 and frequent at St. WS 482, both in 

 the Bransfield Strait, depths 200 and 100 m. respectively, but rare or very rare elsewhere. 



160. Haplophragmoides crassimargo (Norman) (F 92) (SG no). 

 Five stations: 180, 383; WS 495, 516, 517. 



Frequent at Sts. WS 495 and 517 in the Bellingshausen Sea in depths of 2552- 

 2770 m. ; very rare elsewhere. All the specimens are rough externally, except the single 

 specimen noted at St. 180, which is also the only shallow water record (160 m.). 



161. Haplophragmoides sphaeriloculus, Cushman (F 93) (SG in). 



Twenty-four stations: 177, 180, 181, 360, 373, 377, 382, 383; WS 199, 203, 403, 468, 471, 472, 

 474. 479. 494A, 502, 509- 516, 517, 552, 553. 555- 



With very few exceptions the records of this species are confined to the deep water 

 of the Weddell, Scotia and Bellingshausen Seas, and the specimens are usually small and 

 very rare, seldom more than one at a station. Good specimens, however, are frequent at 

 St. 360 in the Scotia Sea (3264 m.), also in 170 m. at Sts. 180, 181. Both of these 

 shallow-water stations are in the Palmer Archipelago. Large and typical specimens 

 were common at St. WS 517 in the Bellingshausen Sea at a depth of 2770 m., which 

 were probably megalospheric, as spherical primordials of large diameter (0-012 mm.) 

 were found associated with them. 



162. Haplophragmoides trullissatus (Brady) (Plate III, fig. 9). 



Trochammina tniUissata, Brady, 1884, FC, p. 342, pi. xl, figs. 14-15 (only). 

 Haplophragmoides trullissata, Cushman, 1918, etc., FAO, 1920, p. 43, pi. ix, fig. 5. 



Thirty-five stations: 177, 180, 181, 194, 363, 382-4, 386; WS 199, 203, 205, 400, 468, 471, 472, 

 474, 483, 488, 494A, 496-8, 503, 506, 507A, 507B, 509-11, 514-17, 555- 



Generally distributed in all the areas and irrespective of depth, the records ranging 



between 160 and 4773 m. Curiously enough the species is common and very well 



developed at the two shallowest stations, 180 and 181, in the Palmer Archipelago, depth 



160 m. It is frequent at Sts. 177 in the Bransfield Strait (1080 m.), WS 474 in the 



Scotia Sea (2813 m.), and WS 510 in the Bellingshausen Sea (505 m.). At the remaining 



stations it is rare or very rare, often represented by single specimens. The colour varies 



greatly between the normal orange and a dark grey, due to the incorporation of black 



volcanic sand. At many stations, notably Sts. WS 471 and 474, the typical evolute form 



occurs in company with an involute form in which only the final convolution is exposed. 



At St. 181 an abnormal specimen was observed, in which each successive chamber was 



