FORAMINIFEKA OF THE ATLANTIC OCEAN 111 



least umbonate, dorsal side nearly flat; chambers numerous, narrow; 

 sutures distinct, limbate, curved, on the ventral side with a decided 

 angle; wall coarsely perforate, the sutures and the spiral suture 

 raised especially on the dorsal side; aperture at the periphery and 

 extending over onto the dorsal side along the inner margin of the cham- 

 ber, with a slight lip. 



Diameter up to 1 mm.; thickness, 0.15 to 0.35 mm. 



This species was described from the Pliocene of Kar Nicobar by 

 Schwager. It has been recorded as " Truncatulina imellerstorji" by 

 many authors from mdely scattered stations and from various fossil 

 deposits. There is a great variation in the thickness of the test and 

 the amount of involution. It tends toward Cibicides in many speci- 

 mens. There is much variation also as in other species of this family 

 in the amount of sculpture of the surface due to excess of lime and 

 a tliickening of the test. The species is fairly common in deep water 

 of many parts of the present oceans. 



PLANUUNA FOVEOLATA (H. B. Brady) 



Plate 20, figures 2, 3 



Anomalina foveolata H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 



1884, p. 674, pi. 94, figs. 1 a-c. — Herox-Allen and Earland, British 



Antarctic Exped., Zoology, vol. 6, 1922, p. 233. 

 Anomalina ariminensis H. B. Brady, Parker, and Jones (part) (not 



d'Orbigny), Trans. Zool. Soc. London, vol. 12, 1888, p. 228, pi. 45, figs. 



21a, 6 (not 21, 22). 

 Discorbina biconcava Flint (not Jones and Parker), Ann. Rep't. U. S. 



Nat. Mus., 1897 (1899), p. 327, pi. 72, fig. 5. 



Test nearly planispiral, compressed, plano-convex, periphery thick 

 and rounded, early whorls visible from both sides of the test; chambers 

 9 to 11 in the last-formed whorl, distinct; sutures oblique, distinct, 

 on the flattened side slightly depressed and slightly limbate, on 

 the convex side raised, especially over the earl}" portion; wall coarsely 

 perforate, on the flattened side fairly smooth, on the convex side 

 sculptured and deeply pitted; aperture mostly peripheral, extending 

 slightly onto the flattened side. 



Diameter 0.50 to 0.70 mm. 



The only Challenger station for this species was off Bermuda in 

 435 fathoms. Heron-Allen and Earland record it from off the coast 

 of Rio de Janeiro, 40 fathoms, a single specimen. Egger records it 

 from off Mauritius, but the figure he gives is not very convincing. 

 It has occurred rarely in the Albatross collections from the Western 

 Atlantic. It may be noted that Brady, Parker, and Jones record 

 a specimen from the Abrohlos Bank as "Anomalina ariminensis" 

 which seems to be this species. *® 



«• Trans. Zool. Soc, London, vol. 12, 1888, pi. 45, fig. 21. 



