ROTALIINAE 409 



Genus Discorbis, Lamarck, 1804 



330. Discorbis cora (d'Orbigny) (Plate XIII, figs. 34-36). 



Rosalina cora, d'Orbigny, 1839, FAM, p. 45, pi. vi, figs. 19-21. 



Discorbina cora, Heron-Allen and Earland, 1922, FGA, p. 133, pi. i (numbered pi. ii), figs. 33-5. 



Four stations: 51, 388; WS 88, 93. 



This very pauperate form described by d'Orbigny from the Peruvian coast, where it 

 vi^as rare, is extremely rare in the Falkland area. Two quite typical specimens at WS 88 

 (greatest breadth, 0-38 mm.), and single very good specimens were found at 388 and WS 

 93, less typical at 51. The specimens from WS 88 are practically identical with d'Or- 

 bigny's figure, and there can be no question as to their discorbine affinities. TheTrun- 

 catuUna cora (d'Orbigny) of Cushman (1922, FTR, p. 48, pi. vii, figs. 3-5 ; 1925, FTCP, 

 P- 133) appears to be quite a different organism, having little resemblance to d'Orbigny 's 

 figure. The Type could not be found in Paris. 



331. Discorbis globularis (d'Orbigny). 



Rosalina globularis, d'Orbigny, 1826, TMC, p. 271, pi. xiii, figs. 1-4, Modele no. 69. 

 Discorbina globularis, Mobius, 1880, FM, p. 96, pi. ix, fig. 18. 

 Discorbina globularis, Brady, 1884, FC, p. 643, pi. Ixxxvi, figs. 8, 13. 



Thirteen stations: 51, 53, 388; WS 84, 88, 89, 90, 92, 97, 215, 217, 225, 408. 



Not particularly abundant except at some stations, notably WS 88, where it was 

 abundant, large, and well developed. The type here is very compressed in contrast to 

 those at WS 225, which are very highly domed. Often sessile on Algae and Polyzoa. 



332. Discorbis mediterranensis (d'Orbigny). 



Rosalina mediterranensis, d'Orbigny, 1826, TMC, p. 271, no. 2. 



Discorbina mediterranensis, Fornasini, 1898, RFI, p. 264 (text-fig). 



Discorbina mediterranensis, Heron-Allen and Earland, 1913, CI, p. 118, pi. ix, figs. 12-14; 



pl.x, fig. I. 



Seven stations: WS 79, 83, 91, 97, 221, 225, 248. 



Sparingly distributed and never very common. Very good specimens at WS 97 and 

 221. The Paris Types are quite unrecognizable. 



333. Discorbis vilardeboana (d'Orbigny) (Plate XIII, figs. 37-39). 

 Rosalina vilardeboana, d'Orbigny, 1839, FAM, p. 44, pi. vi, figs. 13-15. 

 Discorbina vilardeboana, Brady, 1884, FC, p. 645, pi. Ixxxvi, figs. 9, 12. 



Discorbis vilardeboana, Cushman, 1910, etc., FNP, 1915, p. 14, text-fig. 14, pi. ix, fig. 2. 

 Five stations: 388; WS 71, 83, 88, 93. 



This is one of d'Orbigny 's species from the Falkland Islands, where he describes it as 

 rare. It is probably widely distributed and has been more or less overlooked among the 

 many varieties of D. rosacea occurring in the Discovery material. But records have 

 been kept of its occurrence at these four stations, at all of which d'Orbigny's typical 

 form is common and well developed. Average breadth, 0-33 mm.; height, 0-17 mm. 



