FORAMINIFERA OF THE ATLANTIC OCEAN 



109 



Journ. Ro}'. Micr. Soc, 1909, p. 697; Proc. Roy. Irish Acad., vol. 31, pt. 

 64, 1913, p. 147.— CusHMAN, Bull. 71, U. S. Nat. Mus., pt. 4, 1914, p. 37, 

 pi. 14, fig. 7. — Heron-Allen and Earland, Trans. Zool. Soc. London, 

 vol. 20, 1915, p. 737; Trans. Linn. Soc. London, ser. 2, vol. 11, 1916, p. 

 283.— CusHMAN, Bull. 100, U. S. Nat. Mus., vol. 4, 1921, p. 382.— Heron- 

 Allen and Earland, British Antarctic Exped., Zoology, vol. 6, 1922, p. 

 230. — Clodixjs, Archiv. Ver. Freunde Nat. Mecklenburg, 75 Jahr., 1922, 

 p. 144. — Hanzawa, Jap. Journ. Geol. Pal., vol. 4, 1925 (1926), p. 45. 

 Nummulina perforata, var. {Operculina) arnmonoides Parker and Jones, 

 Philos. Trans., vol. 155, 1865, p. 398, pi. 14, fig. 44; pi. 17, figs. 62, 63. 



Test small, compressed, nearly bilaterally symmetrical, periphery 

 subacute to rounded; chambers very distinct, earlier ones somewhat 

 involute, very gradually increasing in size and uniform in shape; 

 sutures strongly limbate on both sides, slightly curved, uniting with 

 the spiral suture to form a raised thickened spiral toward the center 

 of each side; wall smooth, finely perforate; aperture near the periphery 

 but extending somewhat to the ventral side. 



Diameter not usuall}'^ more than 0.50 mm. 



This species is very abundant in the cold waters of the North 

 Atlantic, especially on the eastern side, but does not occur in the 

 Albatross dredgings from the western Atlantic. The species does not 

 belong to Operculina. The early test is spired although the spire 

 is low and the test is not bilaterally symmetrical. It is evidently 

 a form of Anomalina as that genus is now used. 



Heron-Allen and Earland have already indicated that Gronovius's 

 name of Nautilus arnmonoides was not applicable to this small, 

 cold-water form. This is further aggravated by Reuss's species of 

 Anomalina arnmonoides. It is much the best procedure therefore 

 by the rules to take up with Schroeter's name which evidently was 

 applied to the species in question, and is the first available name. 



It has always been an anomaly to have a genus like Operculina 

 which has very complex species characteristics of shallow waters in 

 the tropics include this small species of very cold and often deep 

 waters. 



Anomalina balihica — Material examined 



