ROTALIINAE 433 



Genus Rotalia, Lamarck, 1804 



393. Rotalia beccarii (Linne). 



Nautilus beccarii, Linne, 1767, SN fed. Xii), p. 1162, no. 276. 

 Rotalia beccarii, Brady, 1884, FC, p. 704, pi. cvii, figs. 2, 3. 



One station: 228. 



Only a single small but quite typical specimen at this station, which is between the 

 Falkland Islands and the Burdwood Bank. The extraordinary absence of this cos- 

 mopolitan form from the area is quite inexplicable, especially as no other local species 

 replaces it. 



394. Rotalia broeckiana, Karrer. 



Rotalia broeckiana, Karrer, 1878, FTTL, p. 98, pi. v, fig. 26. 

 Rotalia broeckiana, Brady, 1884, FC, p. 705, pi. cvii, fig. 4 a-c. 



One station: WS 86. 



A single rather small individual. 



394 A. Rotalia soldanii, d'Orbigny. 



Rotalia {Gyroidina) soldanii, d'Orbigny, 1826, TMC, p. 278, no. 5, Modele no. 36. 



Rotalia soldanii, Brady, 1884, FC, p. 706, pi. cvii, figs. 6 and 7. 



Gyroidina soldanii, Cushman, 1918, etc., FAO, 193 1, p. 38, pi. viii, figs. 3-8. 



One station : WS 433. 



A few pauperate specimens. 



395. Rotalia clathrata, Brady (Plate XVI, figs. 1-4). 



Rotalia clathrata, Brady, 1884, FC, p. 709, pi. cvii, figs, 8, 9. 



Rotalia clathrata, Jones and Chapman, 1900, MCI, p. 232, pi. xx, fig. 2. 



Rotalia clathrata. Heron- Allen and Earland, 1922, TN, p. 220. 



Fourteen stations: 48, 388; WS 71, 83, 84, 86, 87, 88, 89, 90, 91, 92, 225, 245 (see also p. 309). 



Moderately frequent at many stations, the best at WS 84, 86, 87, 88. At the latter, in 

 particular, some exceptionally fine specimens were found, up to i-omm. in diameter 

 (fig. i), quite indistinguishable from those of the New Zealand area. At WS 89 and 90, 

 which are at the entrance to the Magellan Straits, the specimens are all very small and 

 starved. The average size of specimens in the area is between 0-40 and 0-50 mm. in 

 greatest diameter. 



The occurrence of R. clathrata in the Falkland area is of extreme interest, as 

 apparently representing the migration of a species from its original habitat. It will be 

 noted that nearly all the stations are situated in the area to the south of the Falkland 

 Islands, and between them and the entrance to the Pacific, and the best stations, WS 86, 

 87, 88, are at the entrance to the Falkland area. The species reaches its maximum 

 development in the Australian and New Zealand seas. Brady also records its occurrence 

 from the islands ofi^ the west coast of Patagonia, and figures specimens from that area to 

 contrast them with those from New Zealand, which are larger and more strongly marked 



