ROTALIIDAE 129 



322. Pulvinulina umbonata (Reuss) (F 386). 

 Two stations: WS 429, 522. 



Very rare. All the specimens, though typical, are small, except one very large shell at 



WS 522. 



323. Pulvinulina exigua, Brady (F 387). 



Eight stations: 15, 145; WS 33, 42, 429, 521, 522; MS 68. 



Frequent at WS 33, elsewhere rare or very rare; but some very good specimens at 



WS 522. 



324. Pulvinulina karsteni (Reuss) (F 391). 



Thirty-eight stations : 13, 14, 16, 20, 23, 27, 42, 45, 123, 126, 131, 136, 140, 144, 148, 149, 157; 

 WS 25, 27, 28, 33, 37, 40, 41, 42, 43, 45, 48, 50, 66, 113, 154, 348, 349, 357, 418, 521 ; MS 14. 



Although generally distributed in the area, the species is usually rare. It is, however, 

 very common at St. 144 and WS 28, and common or frequent at Sts. 45, 126, 149, 

 WS 33, 154 and 349. The most generally distributed type is bi-convex, with a somewhat 

 flattened dorsal side, but practically all the variations noted in the Falkland area were 

 observed. At WS 27 a small form with the dorsal surface quite flat occurs, all the con- 

 volutions are visible and the ventral surface is highly conical. This form occurs also at 

 140 and 144, in company with the normal type and intermediate variations. Very large 

 specimens were observed at several stations, notably St. 27. 



325. Pulvinulina peruviana (d'Orbigny) (F 392). 

 Seven stations: 27, 42, 144, 148; WS 25, 27, 33. 



Very common at St. 144, frequent at St. 27 and WS 27, but elsewhere very rare. 

 Some very large specimens at WS 27. 



326. Pulvinulina pauperata, Parker and Jones. 



Pulvimdiiia paiiperata, Parker and Jones, 1865, NAAF, p. 395, pi. xvi, figs. 50, 51 a, b. 



Pulvinulina pauperata, Brady, 1884, PC, p. 696, pi. civ, figs. 3-11. 



Pulvinulina pauperata, Flint, 1899, RFA, p. 330, pi. Ixxiv, fig. 3. 



Laticarinina pauperata, Cushman, 1918, etc., FAO, 1931, p. 114, pi. xx, fig. 4, pi. xxi, fig. i. 



One station: WS 522. 



Several fairly large specimens from a depth of 2550 m. 



Genus Rotalia, Lamarck, 1804 



327. Rotalia beccarii (Linne) (F 393). 

 Three stations: 20, 149; WS 25. 



Two specimens at WS 25 and one at each of the other stations. All typical but rather 

 small. 



