4IO DISCOVERY REPORTS 



We figure specimens which have been compared with the Type in Paris, and are iden- 

 tical. D'Orbigny's figure is not particularly good — the punctation appearing as too 

 marked. The test is hyaline and very finely punctate, and the characteristic feature is the 

 very large and pronounced terminal chamber. 



334. Discorbis rosacea (d'Orbigny). 



Rotalia rosacea, d'Orbigny, 1826, TMC, p. 273, no. 15, Modele no. 39. 



Rotalia rosacea, Parker, Jones and Brady, 1859, etc., NF, 1865, p. 25, pi. ii, fig. 71. 



Discorbina rosacea, Brady, 1884, FC, p. 644, pi. Ixxxvii, figs, i, 4. 



Twenty-six stations: 48, 51, 388; WS 71, 73, 76, 77, 80, 83, 84, 86, 88, 89, 90, 91, 92, 95, 97, 

 99, 210, 213, 217, 221, 225, 24s, 248. 



Universally distributed, often very abundant. The best stations probably 51, WS 71, 

 83, 84, 91 and 225. Often very variable, though the general form is rather high-domed. 

 At WS 217 the type is lower and more squamous. Sessile at many stations, especially 



51- 



335. Discorbis peruviana (d'Orbigny) (Plate XIV, figs. 1-4). 



Rosalina peruviana, d'Orbigny, 1839, FAM, p. 41, pi. i, figs. 12-14. 



Discorbina peruviana, Heron-Allen and Earland, 1913, CI, p. 122, pi. xi, figs. 1-3. 



Three stations: 48, 51 ; WS 245. 



Few specimens but good examples at WS 245. D'Orbigny's original record was from 

 the Bolivian coast. In Paris, the Type tube from Acapulco contains four specimens, three 

 of them are decomposed and unrecognizable, and the fourth is a typical Discorbina 

 globular is. 



Average breadth, 0-40 mm.; height, o-io mm. 



336. Discorbis araucana (d'Orbigny). 



Rosalina araucana, d'Orbigny, 1839, FAM, p. 44, pi. vi, figs. 16-18. 

 Discorbina araucana, Brady, 1884, FC, p. 645, pi. Ixxxvi, figs. 10, 11. 

 Discorbina araucana, Egger, 1899, KOA, p. 163, pi. xxv, figs. 22-4. 



Seven stations: 53, 228; WS 83, 84, 86, 88, 408. 



Specimens which appear to be attributable to d'Orbigny's species occur sparingly, 

 but are not very typical. The original record was from the Chilean coast. The d'Orbigny 

 Type is a dead shell of thick white texture, the structure rather obscure, but generally 

 agreeing with d'Orbigny's figures. 



337. Discorbis praegeri (Heron-Allen and Earland). 



Discorbina pracgeri, Heron-Allen and Earland, 1913, CI, p. 122, pi. x, figs. 8-10; 1914, etc., 

 FKA, 1915, p. 692; 1916, FWS, p. 270; 1916, FSC, p. 50. 



Nine stations: WS 71, 76, 80, 91, 93, 213, 217, 221, 245. 



This form of Z). rosacea, characterized by a solid, prominent, umbilical stud, is often 

 very common in the Falkland gatherings, notably at WS 91 and 93, where large and 

 typical specimens occur in considerable numbers. 



