FORAMTNIFERA OF THE NORTH PACIFIC OCEAN. 59 



PULVINULINA TRUNCATULINOIDES (d'Orbigny). 

 Plate 23, fig. 4. 



Rotalina truncatulinoides d'Orbigny, in Barker, Webb, and Berthelot, Hist. 

 Nat. Isles Canaries, vol. 2, pt. 2, "Foraminiieres," 1839, p. 132, pi. 2, figs. 

 25-27. 



Pulvinulina truncatulinoides Parker and Jones, Philos. Trans., vol. 155, 1865, 

 p. 398, pi. 16, figs. 41-43. — Rhumbler, in Brandt, Nordisches Plankton, 

 Heft 14, 1900, p. 17, fig. 16.— Chapman, Trans. New Zealand Inst., vol. 

 38, 1905, p. 105; Journ. Linn. Soc, Zoology, vol. 30, 1910, p. 423. 



Rotalina micheliniana d'Orbigny, Mem. Soc. Geol. France, vol. 4, 1840, p. 31, 

 pi. 3, figs. 1-3. 



Discorbina micheliniana Reuss, Sitz. Akad. Wiss. Wien, vol. 52, 1865, p. 455, 

 No. 1. 



Pulvinulina repanda, var. menardii, subvar. micheliniana Parker and Jones, 

 Philos. Trans., vol. 155, 1865, p. 396, pi. 14, fig. 16, pi. 16, figs. 41-43. 



Pulvinulina micheliniana Owen, Journ. Linn. Soc. London, Zool., vol. 9, 1867, 

 p. 148, pi. 5, fig. 17.— Goes, Kongl. Svensk. Vet. Akad. Handl., vol. 19, 

 pt. 4, 1882, p. 114, pi. 8, figs. 296-298.— H. B. Brady, Rep. Voy. Challenger, 

 Zoology, vol. 9, 1884, p. 694, pi. 104, figs. 1, 2.— H. B. Brady, Parker, and 

 Jones, Trans. Zool. Soc. London, vol. 12, 1888, p. 229, pi. 46, figs. 9, 10.— 

 Egger, Abh. kon. bay. Akad. Wiss. Munchen, CI. n, vol. 18, 1893, p. 416, 

 pi. 18, figs. 1-6.— Millett, Journ. Roy. Micr. Soc, 1904, p. 500. 



Pulvinulina micheliniana Flint, Rep. U. S. Nat. Mus., 1897 (1899), p. 330, pi. 74, 

 %• 2. 



Description. — Test subcorneal, the dorsal surface either flat or 

 more often slightly concave, ventral surface forming a truncate cone, 

 umbilicate; peripheral margin 

 angular, bluntly rounded, often 

 slightly carinate; chambers 

 comparatively few, five or six 

 in the last formed whorl, su- 

 tures nearly radial; dorsal sur- 

 face nearly smooth, punctate 



.. _ . 1 Fig. 57.— Pulvinulina trunca tulinoides (d'Orbig- 



or slightly granular, ventral NY ). o, ventral view; 6, side view; c, dorsal view 

 surface very often decidedly (after d'Orbigny). 



granular; aperture a long narrow opening extending from the 

 umbilicus nearly to the peripheral margin. 



Diameter 0.60-1 mm. 



Distribution. — This is one of the most common of the species of the 

 North Pacific, especially at depths which are favorable to the accu- 

 mulation of Globigerina ooze. Brady and Goes record it as pelagic 

 in the North Pacific and Brady records it from five Challenger stations 

 with depths ranging from 345 to 2,950 fathoms. Picaglia records it 

 from a single station of the Vettor Pisani in the North Pacific and 

 Bagg records its occurrence at 17 out of the 19 Albatross stations off 

 the Hawaiian Islands from which he had material, depths ranging 

 from 104 to 1,544 fathoms. 



I have had material from various parts of the North Pacific from 

 Albatross, Nero, Tuscarora, and Alert stations ranging in depth from 



