58 BULLETIN 11, UNITED STATES NATIONAL MUSEUM. 



depressed; wall granular roughened; aperture a narrow arched slit 

 extending from the umbilicus well toward the peripheral margin. 



Diameter 0.25-0.40 mm. 



Distribution. — Brady records Pulvinulina patagonica from four 

 Challenger stations in the North Pacific, the depths ranging from 500 

 to 2,900 fathoms. Bagg records it from two Albatross stations in 

 the vicinity of the Hawaiian Islands H4502 in 1,342 fathoms and 

 H4566 in 572 fathoms. 



From the material I have had this species seems to be rather com- 

 mon in the North Pacific. It was frequent at many Nero stations 

 between Guam and Yokohama depths ranging from 518 to 2,048 

 fathoms. 



This species somewhat closely resembles P. canariensis but may 

 be easily distinguished by the periphery. 



PULVINULINA CRASSA (d'Orblgny). 



Plate 27, fig. 1. 



Rotalina crassa d'Orbigny, Mem. Soc. Geol. France, vol. 4, 1840, p. 32, pi. 3, 

 figs. 7, 8. 



Pulvinulina crassa Owen, Journ. Linn. Soc. Zool. London, vol. 9, 1867, p. 148; 

 pi. 5, fig. 8(?), 9.— H. B. Brady, Quart. Journ. Micr. Sci., vol. 19, 1879, p. 80; 

 Rep. Voy . Challenger, Zoology, vol. 9, 1884, p. 694, pi. 103, figs. 11, 12.— Terrigi , 

 Mem. Com. Geol. Ital., vol. 4, 1891, p. 108, pi. 4, fig. 13.— Egger, Abh. kon. 

 bay. Akad. Wiss. Miinchen, CI. n, vol. 18, 1893, p. 416, pi. 18, figs. 7-12 — 

 Flint, Rep. U. S. Nat. Mus., 1897(1899), p. 329, pi. 74, fig. 1.— Rhumbler, 

 in Brandt, Nordisches Plankton, Heft 14, 1900, p. 17, figs. 12, 14, 15.— Millett, 

 Journ. Roy. Micr. Soc, 1904, p. 500. — Chapman, Trans. New Zealand Inst., 

 vol. 38, 1905, p. 105.— Bagg, Bull. U. S. Nat. Mus., vol. 34, 1908, p. 161.— 

 Chapman, Journ. Linn. Soc. Zoology, vol. 30, 1910, p. 422. 



Description. — Test subconical, the dorsal face flat, ventral face 

 convexly rounded, umbilicate; peripheral margin rounded, lobulated, 

 not carinate; chambers comparatively few, usually but four in the 

 last formed whorl, sutures curved; surface granular or subspinose; 

 aperture an arched opening widest at the umbilical end of the cham- 

 ber and extending nearly to the periphery. 



Diameter 0.50-0.60 mm. 



Distribution. — Brady records Pulvinulina crassa from a single 

 Challenger station in the North Pacific in 2,250 fathoms. Bagg 

 records it from six Albatross stations in the vicinity of the Hawaiian 

 Islands at depths ranging from 384 to 1,544 fathoms. I have failed 

 to find any specimens which I could refer to this species. 



