no DISCOVERY REPORTS 



between 3264 and 4517 ni. Owing to its minute size and colour it may have been over- 

 looked at other stations. 



I have not found it in the Terra Nova material from the Ross Sea after a careful 

 examination of the station slides. 



Genus Miliammina, Heron- Allen and Earland, 1930 



216. Miliammina arenacea (Chapman) (SG, pp. 90, 92) (Plate IV, figs. 20-24). 



MUioliiia oblonga (Montagu) var. arenacea, var. nov., Chapman, 1914, FORS, p. 59, pi. i, fig. 7. 

 Miliolina oblonga var. arenacea {pars), Heron-Allen and Earland, 1922, TN, p. 66. 

 Miliammina oblonga (Chapman) {pars), Heron-Allen and Earland, 1929, etc., FSA, 1930, 

 pp. 41-2, pi. i, fig. 6. 



Miliammina arenacea (Chapman), correspondence T. D. A. Cockerell, E. Heron-Allen and 

 A. Earland, Nature, June 28, 1930, and September 20, 1930. 



Seventy stations: 162, 163, 167, 170, 171, 175, 177, 180, 181, 186, 187, 190, 194, 195-204, 206, 

 209, 36s, 366, 369, 377; 62° 57' S, 60° 20' 30" W; 64° 56' S, 64° 43' W; WS 377, 382-4, 386, 387, 



389, 391, 393-5, 400, 474-6, 479, 480, 482-8, 494A, 494B, 496-8, 506, 507 A, 507B, 509-15. 



Chapman's species is generally distributed in all the areas within the Antarctic con- 

 vergence line, irrespective of depth. It was not found at the few deep-water stations in 

 the Weddell Sea, and in the shallower gatherings from the South Sandwich Islands its 

 distribution is rather curious, for it is common at St. 366 (155-322 m.), very rare at 

 St. 369 (1767 m.), and absent at St. 363 (329-278 m.), which otherwise has the richest 

 fauna of them all. The deepest record is at St. WS 40ooiTthe South Shetlandsin45i7m., 

 where specimens are frequent but rather small. It is common or very common at many 

 stations, and does not appear to be influenced by depth as these range between 130 m. 

 at St. WS 389 and 1600 m. at St. 198. It is readily identified and separated from 

 M. oblonga and M. obliqua in the adult stage owing to its straighter edges, which are 

 nearly parallel and less rounded than in the other species. Young individuals are not so 

 easily distinguished. Apart from size very little variation was observed in the species. 

 The colour varies from nearly white to dark grey or almost black at a few stations where 

 the material was of volcanic origin. 



217. Miliammina obliqua, Heron-Allen and Earland (SG 150). 



Forty-seven stations: 162, 167, 181, 185-7, i9i> 192. 194. 196, 197, 199, 202, 203, 206, 209, 365, 

 366, 369, 377; 62° 57' S, 60° 20' 30" W; WS 383-7, 391, 393, 400, 476, 479, 480, 482-8, 494A, 494B, 

 496,497, 511, 512, 514, 515. 



Although very generally distributed within the Antarctic convergence line, more than 

 half of the records are in the Bransfield Strait and South Shetlands area, and of twenty- 

 one stations at which specimens vary from frequent to very common, the majority are 

 within this area. At the other stations it is rare or very rare. It is very common at 

 St. WS 479 (1523 m.), and common at Sts. WS 385 (1838 m.) and WS 483 (1420 m.), 

 all in the Bransfield Strait. It is also common at St. 167 (344 m.) in the South Orkneys, 

 and at WS 512 (652 m.) in the Bellingshausen Sea. Moderate depths, under 600 m., 

 appear to be most favoured, but there is an exception in St. WS 400, off the South 

 Shetlands, where the species is frequent in 4517 m. With this exception the deepest 



