ROTALIIDAE 183 



Genus Cibicides, Montfort, 1808 



487. Cibicides refulgens, Montfort (F 355) (SG 303). 



Twenty-three stations: 170, 175, 177, 180-2, 186, 190, 195, 196, 363, 366, 369, 385; WS 388, 

 389, 474, 476, 481, 482, 488, 516, 517. 



Very common at Sts. 190 and WS 482 and common at Sts. 170, 175, 180 and 181, 

 all of which are under 350 m.; frequent at Sts. 177, 363, 366 and WS 481 which are 

 between 322 and 1080 m. ; rare or very rare at the remaining stations, some of which are 

 in deep water. Sessile specimens are frequent at Sts. 177, 190 and WS 482, and at 

 Sts. 180, 181 and WS 482 sessile specimens were seen in the encysted condition with 

 extended pseudopodial tubes, as described and figured in the Terra Nova report (H.-A. 

 and E. 1922, TN, p. 207, pi. vii, fig. 23). They were, however, of rare occurrence com- 

 pared with their abundance in the Ross Sea. 



488. Cibicides refulgens var. corticata, var.n. (Plate VIII, figs. 46-48). 

 One station: WS 505. 



Three specimens, the largest nearly 2-0 mm. in diameter and found at St. WS 505 

 in the Bellingshausen Sea, 1500 m., are evidently a varietal form of C. refulgens, 

 which was not recorded at this station. The specimens have apparently lived in the 

 sessile condition and become detached. They are noteworthy on account of the 

 thickening of the wall on the ventral side with a secondary deposit of shell matter which 

 is not smooth but granular, giving an ornamented appearance to the test. One specimen 

 has several supplementary chambers, and is suggestive of some of the Soldanian figures 

 of C. variabilis. 



489. Cibicides lobatulus (Walker and Jacob) (F 356) (SG 304) (Plate VIII, figs. 42-45). 



Twenty-three stations: 170, 175, 177, 180-2, 186, 190, 195, 196, 203, 363, 366, 384-6; WS 204, 

 468, 469, 482, 486, 494A, 506. 



This universally distributed species is rare or very rare except at a few shallow-water 

 stations, 170, 181, 190 and WS 482, where it is common and well developed, and Sts. 

 175 and 177 where it is frequent. The records run down to 4773 m., and in many 

 instances good and typical specimens were found at great depths. Sessile specimens, 

 also encysted individuals, were noted at Sts. 177, 180, 384 and WS 482. At two deep- 

 water stations in the Drake Strait, Sts. 385 and 386, some of the specimens are ex- 

 tremely pauperate, forming a thin and scale-like test, very like Discorbis cora (d'Orbigny). 

 They would hardly be recognizable as Cibicides lobatulus, but for intermediate specimens 

 found at the same stations. 



490. Cibicides variabilis (d'Orbigny) (F 358). 

 Two stations : WS 474, 482. 



Single specimens only. 



491. Cibicides dispars (d'Orbigny) (F 357) (SG 305). 

 One station: 201. 



Two small specimens at this station constitute the only record of the species. It may 

 have been overlooked at other stations owing to its size. 



