NUMMULINIDAE 131 



334. Nonion sloanii (d'Orbigny) (F 403). 

 Three stations: WS 37, 47, 154. 



Rare, but very good specimens at WS 154. Very rare elsewhere. 



335. Nonion stelligerum (d'Orbigny) (F 404). 

 One station : WS 429. 



Very rare. 



336. Nonion boueanum (d'Orbigny) (F 405). 



Nine stations: 123, 131, 136, 144, 149; WS 40, 42, 113, 349. 



Very good specimens are frequent at Sts. 136, 144, 149, the best at 149. At the other 

 stations this species is rare or very rare, but still typical. 



337. Nonion grateloupi (d'Orbigny) (F 406). 

 One station: 144. 



Very rare and pauperate, hardly separable from A'^. sloanii. 



338. Nonion scapha (Fichtel and Moll) (F 407). 



Nineteen stations: 16, 20, 23, 30, 31, 42, 123, 131, 144; WS 27, 28, 33, 40, 43, 50, 348, 349, 418, 

 429. 



Very rare except at St. 123, WS 40 and 349, where it is frequent. Specimens are 

 rather small but quite typical except for a frequent tendency to inequilateral disposition 

 of the chambers, especially noticeable in specimens from WS 43. These inequilateral 

 specimens are inseparable from Nonionella and are evidence that, however convenient 

 from a taxonomic point of view, the genus Nonionella has no zoological value. 



Genus Nonionella, Cushman, 1926 



339. Nonionella iridea, Heron-Allen and Earland (F 410). 



Forty-three stations: 14, 15,20,23,30,31,42,45, 123, 126, 131, 136, 140, 144, 148, 149, 157,660; 

 WS 25, 27, 32, 33, 37, 40, 42, 43, 45, 47, 48, 50, 63, 63-4, 113, 154, 314, 349, 351, 418, 429, 521, 522, 

 523; MS 68. 



Universally distributed and perhaps the most typical species of the area round South 

 Georgia. It is common or very common at many stations, notably St. 144 and WS 33, 

 429 and 523, but rare at some others. 



340. Nonionella turgida (Williamson). 



Rotalina turgida, Williamson, 1858, RFGB, p. 50, pi. iv, figs. 95-7. 

 Nonionina turgida, Brady, 1884, FC, p. 731, pi. cix, figs. 17-19. 

 Nonionina turgida, Cushman, 1918, etc., FAO, 1930, p. 15, pi. vi, figs. 1-4. 



Five stations: 15, 45, 131, 149; WS 33. 



Always rare or very rare except at St. 149 where it is frequent. 



DVII 14 



