FORAMINIFERA OF THE ATLANTIC OCEAN 



45 



1910, p. 422. — SiDEBOTTOM, Mem. Proc. Manchester Lit. Philos. Soc, 

 vol. 54, No. 16, 1910, p. 28. — Chapman, Zool. Res. Endeavour, pt. 3, 1912, 

 p. 311.— Pearcey, Trans. Roy. Soc. Edinburgh, vol. 49, 1914, p. 1029.— 

 CusHMAN, Bull. 71, U. S. Nat. Mus., pt. 5, 1915, p. 60, pi. 23, fig. 5.— 

 Chapman, Biol. Res. Endeavour, vol. 3, pt. 1, 1915, p. 32. — Sidebottom, 

 Journ. Roj'. Micr. Soc, 1918, p. 260. — Heron-Allen and Earland, 

 British Antarctic Exped., Zoolog}^ vol. 6, 1922, p. 217. 



Test small, almost equally biconvex, peripheral margin bluntly 

 rounded, often lobulated; chambers few, five or six in the last-formed 

 whorl, periphery of each marked b}'' clear material; sutures distinct, 

 on the dorsal side somewhat oblique, ventrally nearly radial and more 

 distinctly depressed; wall smooth; aperture at the margin of the last- 

 formed chamber, on the ventral side midwa}^ between the periphery 

 and the umbilicus. 



Diameter, 0.30 to 0.50 mm. 



This is a very distinctive little species, very widety distributed in 

 fairl}^ deep water. The only specimens I have had from the Atlantic 

 are from Albatross Stations, and they are rare. Brady in the Challenger 

 Report records the species from twelve stations in the North Atlantic 

 from 64 to 2,740 fathoms, and at four in the South Atlantic, 1,025 to 

 2,470 fathoms. 



Eponides exigua — Material examined 



EPONIDES FRIGIDA (Cushman) 



Pulvinulina karsteni H. B. Brady (not Reuss), Trans. Linn. Soc. London, 

 vol. 24, 1864, p. 470, pi. 48, fig. 15; Ann. Mag. Nat. Hist., ser. 5, vol. 1, 

 1878, p. 436, pi. 21, fig. 11 a-c. 



Pulvinvlina re-panda (Fichtel and Moll), var. karsteni Parker and Jones, 

 Philos. Trans., vol. 155, 1865, p. 396, pi. 14, figs. 14, 15, 17. 



Pulvinulina frigida Cushman, Contrib. Canadian Biol., 1921 (1922), p. 12. 



Test small, biconvex, rotaliform, composed of about two and one- 

 half coils; chambers distinct, usually sLx in the last-formed coil; 

 sutures distinct but not depressed on the dorsal side, on the ventral 

 side slightly depressed and filled with an amorphous material radiat- 

 ing out from the umbilical region; wall clear and translucent on the 

 dorsal side, usually showing all the chambers back to the proloculum 

 distinctly, on the ventral side less clear. 



Diameter up to 0.4 mm. 



