76 DISCOVERY REPORTS 



on a large sand grain. As a rule sand grains only are used for building, but highly 

 spicuHferous examples were frequent at St. WS 472, and rarer at WS 474. 



Genus Psammatodendron, Norman, 1881 



123. Psammatodendron arborescens, Norman. 



Psatnmatodmdron arborescens (Norman MS.), Brady, 1881, HNPE, p. 98. 

 Hyperammina arborescens, Brady, 1884, FC, p. 262, pi. xxviii, figs. 12, 13, text-fig. 10. 

 Psammatodendron arborescens, Cushman, 1918, etc., FAO, 1918, p. 79, pi. xxx, figs, i, 2. 



One station, 194. 



A single branching fragment, from 812 m., which cannot be mistaken for any other 



organism. 



124. Psammatodendron indivisum, Heron-Allen and Earland (F 77) (SG 90). 

 One station : 206. 



Doubtfully represented by one specimen, which is apparently a basal pad with a 

 fragment of the stem attached. 



Genus Marsipella, Norman, 1878 



125. Marsipella cylindrica, Brady (F 78) (SG 92). 



Ten stations: 386; WS 199, 468, 471, 472, 474, 507 A, 515, 517, 555. 



Except for rare fragments at St. WS 507 a, 515, 517 in the Bellingshausen Sea, the 

 species is confined to the deep water in the Weddell and Scotia Seas and the Drake 

 Strait. It is frequent at St. WS 472 (3580 m.), but rare elsewhere. Specimens using 

 sponge spicules for construction were found at Sts. WS 471, 507 a. At St. WS 555 in 

 the Weddell Sea (3850 m.) the tests are abnormally thin and collapsible, a very unusual 

 feature in this species. 



Genus Rhabdammina, M. Sars, 1869 



126. Rhabdammina abyssorum, M. Sars (F 79). 

 Four stations: 161 ; WS 475, 482, 515. 



Fragments of varying sizes only were found, the largest at St. WS 475. The species is 

 probably widely distributed, as fragments were found at other stations which could not 

 be identified with certainty. 



127. Rhabdammina discreta, Brady (F 80) (SG 93). 



Ten stations: 177, 196; WS494A, 497, 498, 506, 507 A, 507 b, 511, 514. 



The only perfect specimens were a series received in spirit, which had been picked 

 out on the ship from material dredged at St. 177, 1080 m. The species was probably 

 common there as, judging by the numerous fragments, it is at Sts. WS 507 a, 507 b. 

 Fragments were also frequent at Sts. WS 494A, 497, 506 and 514; rare elsewhere. 



128. Rhabdammina linearis, Brady. 



Rhabdammina linearis, Brady, 1879, etc., RRC, 1879, P- 37' P^- "i> %s. 10, 11; 1884, FC, 



p. 269, pi. xxii, figs. 1-6. 



Rhabdammina linearis. Goes, 1894, ASF, p. 18, pi. iv, figs. 65-6. 



Rhabdammina linearis, Cushman, 1918, etc., FAO, 1918, p. 19, pi. vii, figs. 2-5. 



