124 DISCOVERY REPORTS 



291. Spirillina obconica, Brady (F 321). 

 Two stations: 145, 149. 



A single specimen at each station. 



292. Spirillina obconica var. carinata, Halkyard (F 321 a). 



Spirillina vivipara, var. carinata, Halkyard, 1889, RFJ, p. 69, pi. ii, fig. 6. 



Spirillina vivipara, var. carinata, Sidebottom, 1904, etc., RFD, 1908, p. 8, pi. ii. fig. 4. 



Spirillina obconica var. carinata, Heron-Allen and Earland, 1913, CI, p. 108, pi. ix, figs. 6, 7. 



One station: WS 33. 

 A single specimen. 



Sub-family ROTALIINAE 

 Genus Patellina, Williamson, 1858 



293. Patellina corrugata, Williamson (F 326). 



Fourteen stations: 30, 123, 140, 144, 145, 149, 157; WS 18, 25, 27, 33, 51, 154, 314. 



Never very common except at St. 123, WS 27 and 33. The largest specimens, however, 

 were noted at 149 and WS 25, where the species was comparatively rare. At most 

 stations both circular and oval types occur. Most of the specimens are megalospheric, 

 but microspheric individuals were seen at several stations. The species nowhere attains 

 the large size of some of the Falkland individuals, but is quite up to average dimensions. 



Genus Discorbis, Lamarck, 1804 



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



Twenty stations: 27, 30, 45, 123, 126, 136, 140, 144, 145, 148, 660; WS 25, 27, 33, 154, 314, 348, 

 418; MS 14, 68. 



Generally distributed and often very abundant. The species occurs both free and 

 sessile and the specimens cover a very wide range of variation in size, convexity and 

 shape. At some of the stations, notably St. 123, WS 25 and 33, specimens grow to a 

 large size and become very irregular with age. Encystment was observed at WS 33 and a 

 budding specimen at WS 25, at which station also specimens were found entirely covered 

 with a Diatom, Cocconeis sp. 



295. Discorbis globularis var. anglicus, Cushman (Plate IV, figs. 26, 27). 



Discorbina irregularis, Heron-Allen and Earland {nan Rhumbler), 1913, CI, p. 120, pi. x, figs. 



2-4. 



Discorbis globularis, var. anglica, Cushman, 1918, etc., FAO, 1931, p. 23, pi. iv, figs. 10 a-c. 



Two stations : 45 ; WS 25. 



Particularly fine examples of the irregular formation figured by us from Clare Island 

 {lit supra) and ascribed to Rhumbler's species, D. irregularis, occur at these two stations. 

 Many less wild-growing occur at other stations and were not separated from D. globularis. 



