loo DISCOVERY REPORTS 



192. Trochammina malovensis, Heron-Allen and Earland (F 109) (SG 135). 

 Fifty-six stations: 164, 167, 170, 171, 175, 180, 186, 187, 192, 194-8, 200-4, 206, 209, 360, 362, 



366, 369; Port Lockroy; 62° 57' S, 60° 20' 30" W; WS 382-7, 389, 391, 394, 395, 400, 469, 476, 

 479, 480-6, 494A, 497, 498, 506, 507B, 509, 516, 517. 



Generally distributed, and found at all depths down to 4517 m. at St. WS 400, where 

 a single small specimen was found. At the same time it is most at home in shallow water, 

 and the great majority of records are from under 1000 m. It is very common in the 

 anchor mud at Port Lockroy, and also at St. WS 479, common at Sts. 175, 209, 366, 

 WS 383, 385 and 482. The best and most typical specimens were found at Sts. 175, 366 

 and WS 482. There is great variation in the size attained, and also in the height of the 

 spire. At many stations both high and low forms occur together, but at others, notably 

 at Sts. 180, WS 385, 386 and 479, the low-spired form predominates and can hardly be 

 separated from T. nana. 



193. Trochammina nana (Brady) (F no) (SG 136). 



Sixty-nine stations: 162, 163, 167, 169, 170, 171, 175, 177, 180-2, 185, 187, 190-2, 194-6, 200, 

 202-4, 206, 360, 363, 365, 366, 369, 373, 377, 382; 62° 57' S, 60° 20' 30" W; 64° 56' S, 64°43' W; 

 WS 199, 203, 377, 382, 386, 387, 391-6, 403, 480-5, 487, 488, 489, 493, 494A, 494B, 497, 507 A, 

 507B, 509, 510, 512, 513, 515-17. 



Generally distributed and found at all depths down to 4259 m. at St. WS 203, where 



it is very rare. Most of the records are from depths under 1000 m., and in these shallower 



waters the species is often of frequent occurrence, though seldom common except at 



Sts. 177, 190, 363, 366 and WS 482. The best specimens were observed at Sts. 170, 363, 



365, WS 482 and 516. A few sessile specimens at St. 181. The species is very variable 



and often almost inseparable from the flattened forms of T. malovensis. More or less 



irregularly grown specimens resembling Brady's figures (B. 1884, FC, pi. xxxv, figs. 7, 



8) were observed at many stations, including Sts. 170, 190, WS 482. Among them could 



be found specimens very similar to those figured in the Terra Nova report as arenaceous 



isomorphs of other species (Truncatulina lobatula var. arenacea (H.-A. and E., 1922, TN, 



p. 208, pi. vii, figs. 32-5), Rotalia soldanii var. arenacea {ibid., p. 220, pi. vii, figs. 29-31) 



and Noniofiina turgida var. arenacea [ibid., p. 228, pi. vii, figs. 36-8)). Wiesner records 



and figures a new variety, Haplophragmoides canariensis var. inhaerens (W. 1931, FDSE, 



p. 95, pi. xii, fig. 137), which is based on one of the Terra Nova figures of Truncatidina 



lobatida var. arenacea, but both his figure and the original seem nearer to T. nana than 



to Haplophragmoides canariensis. 



194. Trochammina grisea, sp.n. (Plate III, figs. 35-37). 

 One station: 363. 



Test free, large, consisting of about three convolutions of six chambers, all exposed 

 on the dorsal side, which is flattened except where it rounds off to the peripheral edge. 

 Sutures on the dorsal side straight and distinct, but only very slightly depressed. 

 Peripheral edge round, entire except at the last few chambers where it is slightly 

 lobulate. Ventral side deeply depressed at umbilicus, exhibiting the last whorl of six 

 very slightly inflated chambers ; sutures more depressed than on dorsal side. Aperture 



