40 DISCOVERY REPORTS 



Sts. 280, 286, 300, 416, 418 and in the trawl washings at Sts. 313 and 417; rare else- 

 where. 



This is one of the most characteristic and widely distributed species of the Weddell 

 Sea, and is more abundant in the deep water clays, where few species flourish, than near 

 the Antarctic coast-line. Specimens vary greatly in size, the large microspheric form 

 occurring with unusual frequency and sometimes predominating to the exclusion of the 

 smaller megalospheric form. The number of chambers varies greatly between 10 and 

 the typical 15 described by Brady. 



Pearcey: 300, 313, 338, 416, 417, 420, 447 "but nowhere common". 



102. Cyclammina bradyi, Cushman (A 214). 



Nine stations: 290, 303, 309, 312, 313, 387, 417, 422, 428. 



Occurs with variable frequency, but never common. The best and largest specimens 

 in the trawl washings from Sts. 313 and 417 ; at the other stations specimens were rather 

 under normal size. Both megalospheric and microspheric forms were noted at St. 309. 

 As recorded in A 214, specimens often incorporate sand grains in the usual cement. 



Pearcey does not record the species as such, but it is possibly included in his records 

 of Haplophragmoides tnillissatus (Brady) (No. 68), Cushman's species having been 

 erected on one of Brady's figures of Trochammina trullissata. 



Subfamily SILICININAE 

 Genus Spirolocammina, Earland, 1934 



103. Spirolocammina tenuis, Earland (A 215) (Plate I, figs. 35-37). 

 Two stations: 312, 438. 



Frequent at St. 312, to the south-east of the South Orkneys, and not very far from 

 St. WS 199, the principal locality for the types; here 13 specimens were found, in all 

 stages of growth. Only two specimens at St. 438, which is far to the north-east on the 

 eastern edge of the Weddell Sea. Both stations are in very deep water, 1956-2518 

 fathoms, approximately the same depth as the original types from the Scotia and 

 Bellingshausen Seas, 3264-4517 metres. 



The sigmoiline curve is quite pronounced in young individuals, but becomes flattened 

 out in large adult tests. 



Genus Miliammina, Heron-Allen and Earland, 1930 



104. Miliammina arenacea (Chapman) (SG, pp. 90, 92) (A 216) (Plate I, figs. 38-40). 

 One station: 406. 



Twelve specimens in all were found at St. 406, the nearest inshore station off Coats 

 Land, 1131 fathoms. They are all much below the average size, and only the largest 

 have the specific characters sufficiently developed to be identified with certainty. The 

 young individuals (as mentioned in A 216) are not specifically identifiable, but in the 

 absence of adult specimens of the other species are almost certainly M. arenacea. All 

 the specimens are nearly white in colour. 



