iSo DISCOVERY REPORTS 



and some diminution in their size as the higher latitudes are reached; also the entire 

 absence of the species in the Weddell Sea. 



Family ROTALIIDAE 



Sub-family SPIRILLININAE 



Genus Spirillina, Ehrenberg, 1841 



470. Spirillina vivipara, Ehrenberg (F 319) (SG 290). 

 One station : WS 482. 



Three small specimens from 50 m. at St. WS 482. 



471. Spirillina wrightii, Heron- Allen and Earland (Plate VIII, figs. 18, 19). 



Spirillina margaritifera {non Williamson), Terquem, 1875, etc., APD, 1881, p. no, pi. xiii, 

 fig. 2 a, b. 



Spirillina margaritifera [non Williamson), Wright, 1885-6, BLP, p. 321, pi. xxvi, fig. 12 a, b. 

 Spirillina margaritifera {non Williamson), Halkyard, 1889, RFJ, p. 69, pi. ii, fig. 7. 

 Spirillina wrightii, Heron-Allen and Earland, 1930, FPD, p. 181, pi. iv, figs. 54-8. 



One station: 170. 



A few specimens were found at St. 170, Clarence Island, in 342 m. Spirillina tuber- 

 culata, Brady, also occurs at this station, and until young specimens of that species 

 exactly resembling the adult were discovered, it was thought that the specimens ascribed 

 to S. wrightii were the young of S. tiibercidata. I have no doubts now as to their dis- 

 tinctive nature, but it is evident that the two species are closely related. 



472. Spirillina tuberculata, Brady (F 324) (Plate VIII, figs. 16, 17). 

 Three stations: 170, 175, 190. 



Rare at St. 170; only a single large specimen at each of the other stations. This is the 

 largest species of the genus, and so essentially Antarctic that it seems probable that the 

 few records outside that area must refer to some other species. 



Sub-family ROTALIINAE 

 Genus Patellina, Williamson, 1858 



473. Patellina corrugata, Williamson (F 326) (SG 293). 

 Eight stations: 170, 175, 177, 363, 385, 386; WS 481, 482. 



Rare or very rare everywhere, but very large specimens at Sts. 170 and WS 481. All 

 the other stations yielded good but smaller specimens except Sts. 385 and 386, which 

 are in very deep water, 3638-4773 m. At each of these a single example only was found, 

 small and at St. 386 so pauperate as to be quite flat and scale-like. 



Genus Discorbis, Lamarck, 1804 



474. Discorbis globularis (d'Orbigny) (F 331) (SG 294). 

 Ten stations: 163, 164, 167, 175, 181, 195, 363, 366, 382; WS 482. 



Common at St. WS 482 and frequent at St. 175, very rare elsewhere. Except for a 

 single very small but typical specimen at St. 382 in 3647 m., all the records are from 

 moderate depths, 18-395 ™- Sessile specimens were found at Sts. 363 and WS 482. 



