LITUOLIDAE 105 



dorsal surface is almost flat in his figure and he says it is "raised only a little", whereas 

 in T. discorbis the spire is quite high for the diameter of the shell. At the same time 

 Egger's species is nearer to mine than any other with which I am acquainted, and they 

 may be related. 



Egger's specimens were from West Australia, 357 m., 18° 52' S, 116° 18' E. 



Genus Globotextularia, Eimer and Fickert, 1899 



205. Globotextularia anceps (Brady) (F 112) (SG 141). 



Thirty-three stations: 169, 170, 175, 177, 180, 181, 196, 204, 362, 369, 383; WS 204, 385, 468, 

 471, 476, 479, 487, 494A, 498, 502, 506, 507 A, 507B, 509-12, 515-17, 552, 553. 



Generally distributed in all the areas and at all depths, but rarely more than one or 

 two specimens at a station, except at St. 177, where it was not infrequent and larger 

 than usual. The best examples were noticed at Sts. 170, 175, 177, 180, 181, WS 204, 

 385, 468, 494 A, 507 B, 510, 511, 517 and 552. At most of these stations the specimens 

 were considerably larger and more coarsely constructed than elsewhere. In several in- 

 stances this larger variety occurs with the smaller form. 



Genus Ammosphaeroidina, Cushman, 19 10 



206. Ammosphaeroidina sphaeroidiniformis (Brady) (SG 142). 

 Four stations: 170, 363; WS 201, 469. 



Excellent specimens were found at each of these stations but never with any fre- 

 quency. The species is, however, not easily distinguishable, which may account for the 

 paucity of records here and elsewhere. The four stations vary greatly in depth, two being 

 under 400 m. and the others about the 4000 m. line. 



Genus Cystammina, Neumayr, 1889 



Note. On grounds of priority Cystammina must supersede Ammochilostoma, Eimer 

 and Fickert, 1899. 



207. Cystammina argentea, sp.n. (Plate IV, figs. 17 19). 

 Five stations: WS 377, 400, 496, 497, 514. 



Test minute, a very elongate oval with almost parallel edges; only three chambers 

 visible externally, the last two nearly concealing the earlier of the three. Chambers not 

 inflated, sutures obscure; aperture an arched slit under the edge of the final chamber. 

 Constructed of very fine material, perhaps mud. Colour silvery grey. 



Length about 0-2 mm. ; breadth at widest point near aperture 0-09 mm. 



This is a very minute organism, and was at first thought to be a young or pauperate 

 form of C. paiicilocidata (Brady) ; but its uniform size, distinctive colour and separate 

 distribution show that it is specifically distinct. C. argentea does not occur at any station 

 where C paiicilocidata was recorded, and young individuals of the latter species are 

 ferruginous, and have the same short turgid chambers as the adult shell. It is very rare 

 everywhere except at Sts. WS 496 and 497, from each of which several specimens were 

 obtained. 



DX H 



