FOKAMINIFEKA OF THE NORTH PACIFIC OCEAN. 



57 



Description. — Test biconvex, dorsal surface somewhat umbonate 

 ventral low and broadly rounded, umbilicate; peripheral margin 

 acute, conspicuously lobulated with rounded angles, slightly carinate; 

 chambers comparatively few, usually five in the last formed whorl; 

 sutures distinct above, slightly depressed, below much depressed; 

 wall of earlier portion spinosely granular, later chambers becoming 

 progressively smooth, the last formed chamber often very smooth; 

 aperture a narrow curved slit extending from the umbilicus well 

 toward the peripheral margin. 



Diameter up to 1.25 mm. 



Distribution. — In the Challenger Report Brady states that this 

 species is much less common in the North Pacific and Indian Ocean 

 than in the other oceans. As far as the 

 North Pacific is concerned this is appar- 

 ently due to lack of material at his dis- 

 posal. He recorded it from but one 

 North Pacific station off Japan in 345 

 fathoms. Bagg records it from 15 out 

 of 19 Albatross stations from which he 

 had material off the Hawaiian Islands, 

 depths ranging from 104 to 1,544 fath- 

 oms. I have had specimens from Alba- 

 tross H2923 in 392 fathoms off the Hawaiian Islands and D2806 in 

 1,379 fathoms off the Galapagos Islands. Between Guam and Japan 

 it has occurred at numerous Nero stations, depths ranging from 264 

 to 1,990 fathoms. 



Brady also records the species from one surface station in the 

 North Pacific. 



Fig. 55.— Pulvinulina canaeiensis 

 (d'orbigny)- a, ventral view; 6, side 

 view; c, dorsal mew. (After d'Or- 

 bigny's type figure.) 



PULVINULINA PATAGONICA (d'Orbigny). 



Rotalina patagonica d'Orbigny, Voy 

 Amer. Merid., 1839, " Foramini- 

 feres," p. 36, pi. 2, figs. 6-8. 

 Pulvinulina patagonica H. B. Brady, 

 Rep. Voy. Challenger, Zoology, vol. 

 9, 1884, p. 693, pi. 103, fig. 7a-c.~ 

 Egger, Abb., kon. bay. Akad. Wias. 

 Miincben, CI. n, vol. 18, 1893, p. 

 413, pi. 17, figs. 16-18. — RHUMBLEr:, 

 in Brandt, Nordisches Plankton, 

 Heft 14, 1900, p. 13, fig. 5.— Mtxlett, Journ. Roy. Micr. Soc, 1904, p. 500 — 

 Bagg, Bull. U. S. Nat. Mus., vol. 34, 1908, p. 162.— Chapman, Journ. Linn. 

 Soc., Zoology, vol. 30, 1910, p. 422. 



Description. — Test small, biconvex, dorsal side more convex than 

 the ventral; peripheral margin rounded, slightly lobulated; chambers 

 few, usually five in the last formed whorl; sutures much curved, 



a 



Fig. 56.— Pulvinulina patagonica (d'Or- 

 bigny). a, dorsal view; b, side view; c, 

 ventral view. (After d'Orbigny's type 



FIGURE.) 



