70 DISCOVERY REPORTS 



Wiesner, since Cushman's book was published. They agree that the two genera are 

 distinct. 



Genus Thurammina, Brady, 1879 



99. Thurammina papillata, Brady (SG 72). 



Sixteen stations : 175, 177, 180, 360, 383; WS 199,201,385,403,471,474,483,485, 502, 509,553. 



Seldom more than a single specimen at each station, and with very few exceptions 

 confined to deep water, the best specimens being found at Sts. WS 553 (5029 m.), 

 WS 471 (3762 m.). At Sts. 177, WS 385, 485, 509 the single specimens were very small ; 

 chitinous at WS 485. 



100. Thurammina castanea, Heron-Allen and Earland (F 61 a). 

 Five stations: 170, 177; WS 483, 505, 553. 



A single specimen only at each station, the best at Sts. WS 505, 553. A typical but 

 entirely chitinous example at St. 170. 



101. Thurammina haeusleri, Heron-Allen and Earland (SG 73). 

 Nine stations: 175, 177, 181, 190, 206, 363; WS 201, 472, 482. 



Good specimens at all the stations, but seldom more than one or two at each, except 

 at Sts. 175, 181, where it was more frequent. All the stations are in shallow water except 

 Sts. 177 and WS 201. At the latter an exceptionally large specimen was found in 

 4134 m. 



102. Thurammina albicans, Brady (SG 75). 



Ten stations: 175, 180-2, 190, 363, 373; WS 199, 495, 507B. 



A rare species everywhere, but some excellent specimens were found, the best being 

 at Sts. 181 and 363. A closely allied form differing from T. albicans in the irregular 

 form of the test is described as a new species under the name T. corrugata. It occurs 

 with T. albicans at Sts. 175, 181. 



103. Thurammina corrugata, sp.n. (Plate H, figs. 15-18). 

 Seven stations: 170, 175, 177, 181 ; WS 482, 484, 494 A. 



Test free, of variable shape, more or less spherical, oval or of entirely irregular form. 

 Surface smooth but not polished, dented, puckered or sometimes deeply corrugated. 

 Furnished with numerous bluntly conical and perforated papillae. Shell firm and 

 moderately thick, composed of very fine mineral grains without visible cement. Colour 

 nearly white. Size variable, up to i-o mm. in greatest diameter. 



This appears to be a distinctive species. Its colour and the construction of the test 

 indicate affinity with T. albicans, but its irregular shape is a constant and characteristic 

 feature. In this respect it evidently bears the same relationship to T. albicans as T. 

 haeusleri does to T. papillata. 



Several specimens were found at most of the stations, and in company with T. 

 albicans at Sts. 175, 181. The species probably has a wide distribution, as specimens 

 were found at Terra Nova St. 96 d off the North Cape, New Zealand, and recorded 

 under the name T. papillata var. albicans (H.-A. and E. 1922, TN, p. 108). 



