CASSIDULININAE 357 



Sub-family CASSIDULININAE 

 Genus Cassidulina, d'Orbigny, 1826 



157. Cassidulina laevigata, d'Orbigny. 



Cassidulina laevigata, d'Orbigny, 1826, TMC, p. 282, no. i, pi. .xv, figs. 4, 5. 

 Cassidulina laevigata, Williamson, 1858, RFGB, p. 68, pi. vi, figs. 141, 142. 

 Cassidulina laevigata, Brady, 1884, FC, p. 428, pi. liv, figs. 1-3. 



Twenty-eight stations: 48, 51, 53, 228, 230, 235, 236, 388; WS 71, 73, 77, 80, 83, 86, 87, 88, 89, 

 90, 97, 99, 215, 217, 221, 245, 248, 40S, 409, 433. 



Curiously rare and small at most stations, but becoming more common and larger at 

 the stations to the north of the Falkland Islands. The best specimens and most numerous 

 were found at 230, 235, 236 and WS 433, notably the last, where it was very common. 

 Also at WS 86, 87 and 408 on the Burdwood Bank. The Paris Type is missing. 



158. Cassidulina pulchella, d'Orbigny (Plate IX, figs. 19-21). 



Cassidulina pulchclla, d'Orbigny, 1839, FAM, p. 57, pi. viii, figs. 1-3. 

 Cassidulina pulchella, Cushman, 1927, FWCA, p. 166, pi. vi, fig. i. 



Thirteen stations: 388; WS 84, 86, 87, 88, 90, 91, 93, 95, 219, 245, 248, 408. 



This is one of the species figured in d'Orbigny's Amerique Meridiotiale, but, curiously 

 enough, he records it only from the Peruvian Coast, where it is, he says, " uncommon ". 

 How he can have failed to find it in the Falkland Islands material is not easily under- 

 stood, as it is fairly generally distributed and quite typical. The best specimens occur at 

 WS 86-88. At some of the other stations, notably WS 90, 93 and 95, the specimens are 

 very small. D'Orbigny's figure is rather misleading, the peripheral edge showing a 

 broken line due to the recurvature of the posterior edge of the chambers, but in our 

 specimens, and in the Types in Paris, there is no sign of this, the periphery being rounded 

 and unbroken. 



159. Cassidulina nitidula (Chaster). 



Pulvinulina nitidula. Chaster, 1892, FS, p. 66, pi. i, fig. 17. 



Pulvinulina nitidula, Sidebottom, 1904, etc., RFD, 1909, p. 9, pi. iv, fig. 2. 



Cassidulina nitidula, Heron-Allen and Earland, 1913, CI, p. 70, pi. v, figs. 6-9. 



Two stations: 388; WS 88. 



One specimen at 388 and two excellent specimens at WS 88. This little species 

 appears to have a world-wide distribution, although owing to its small size it is probably 

 often overlooked. 



160. Cassidulina crassa, d'Orbigny (Plate IX, figs. 26-33). 



Cassidulina crasso, d'Orbigny, 1839, FAM, p. 56, pi. vii, figs. 18-20. 



Cassidulina crassa, d'Orbigny, 1846, FFV, p. 213, pi. xxi, figs. 42, 43. 



Cassidulina crassa, Brady, 1884, FC, p. 429, pi. liv, figs. 4, 5. 



Cassidulina crassa, Faure-Fremiet, 1913-14, FMAF, 1913, p. 263, fig. 6 (c); 1914, p. 5, pi. O, 



fig- 7. 



9-2 



