FORAMINIFEEA OF THE ATLANTIC OCEAN 21J 



ELPHIDIUM SIBIRICUM (Goes) 



Plate 11, figure 7 



Polystomella sibirica Goes, Kongl. Svensk. Vet. Akad. Handl., vol. 25, No. 

 9, 1894, p. 100, pi. 17, fig. 814.— CusHMAN, Bull. 71, U. S. Nat. Mus., 

 pt. 4, 1914, p. 34, pi. 19, fig. 1. — Chapman, New'Zealand Geol. Survey, 

 Pal. Bull., No. 11, 1926, p. 89, pi. 17, fig. 14. 



Test of very large size for the genus, strongly compressed, periphery 

 rounded, slightly lobulate, umbilical regions slightly depressed and 

 the coils not completely involute, exposing some of the early coils in 

 the central region; chambers numerous, as many as 25 in the last- 

 formed coU, very slightly inflated; sutures distinct, very slightly 

 depressed, marked by a single or double line of pores; wall smooth; 

 aperture consisting of numerous small rounded pores in an inverted 

 V-shaped arrangement. 



Diameter, up to 4 mm.; thickness, 0.30 mm. 



Goes described this species from off Nova Zembla in shallow water at 

 about 15 fathoms. I have recorded typical specimens irom Albatross 

 Station D 3600 in 156 fathoms in Bering Sea. It is to be looked for 

 in shallow water of the Arctic bordering on the North Atlantic. 



Genus POLYSTOMELLINA Yabe and Hanzawa, 1923 



Polystomellina Yabe and Hanzawa, Jap. Journ. Geol. Geog., vol. 2, 1923, 

 p. 99. — Cushman, Special Publ. No. 1, Cushman Lab. Foram. Res., 1928, 

 p. 208. 



Genoholotype. — Polystomella (Polystomellina) discorhinoides Y&he and 

 Hanzawa. 



Test similar to ElpMdium in general structure but trochoid, plan- 

 oconvex, ventral side flattened, dorsal side convex. 



Tertiary and Recent. 



The species of this genus seem to be largely confined to the Pacific 

 region. No species are recorded from any part of the Atlantic. 



Genus FAUJASINA d'Orbigny, 1839 



Faujasina d'Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, 

 " Foraminif eres, " p. 109. — Cushman, Special Publ. No. 1, Cushman 

 Lab. Foram. Res., 1928, p. 208. 



Genoholotype. — Faujasina carinata d'Orbigny. 



Test similar to ElpMdium but trochoid, planoconvex, dorsal side 

 flattened, ventral side convex. 



Cretaceous to Recent. 



Some of the fossil species of this genus become very abundant at 

 restricted localities. It was probably an attached form. There do 

 not seem to be any living Atlantic species. 



