FORAMINIPERA OF THE NORTH PACIFIC OCEAN. 31 



SPIROLOCULINA GRATELOUPI d'Orbigny. 

 Plate 4, figs. 4, 5. 



Spiroloculinn grateloupi d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 298. — ■ 

 Terqtjem, Mem. Soc. Geol. France, ser. 3, vol. 1, 1878, p. 52, pi. 5, figs. 

 5, 6.— Weisner, Archiv. Prot., vol. 25, 1912, p. 208. 



Spiroloculina excavata H. B. Brady (not d'Orbigny), Rep. Voy. Challenger, 

 Zoology, vol. 9, 1884, p. 151, pi. 9, figs. 5, 6. 



Description. — Test elongate, broadest in the center, tapering 

 toward either end, chambers rapidly thickening as added, in end 

 view the periphery much the broadest portion of the test, central 

 portion deeply excavated ; periphery of the chambers in end view much 

 convex, especially in the central portion, the edges broadly rounded; 

 chambers evenly curved, the final chamber somewhat projecting 

 both at the base and at the apertural ends, the latter having a 

 decided neck with a phialine lip, the aperture itself rounded and 

 with either a single tooth with a bifid end, the two projections form- 

 ing a concave extremity or in some cases a pair of such bifid teeth 

 opposite one another; surface of the test dull, somewhat roughened. 



Length, 1-1.5 mm. 



Distribution. — From the existing records this seems to -be a species 

 of a rather tropical distribution. The only published record for 

 the North Pacific is that given by Brady, Challenger station 260A, 

 in 40 fathoms, on the Honolulu coral reefs. 



I have had material from the same region and from Nero station 

 2042 in 55 fathoms, Waimea Bay, Hawaiian Islands It has also 

 occurred in material from Hongkong and from Singapore. In the 

 material of the North Pacific Exploring Expedition, Captain Rodgers, 

 it occurs in Gaspar Straits. From the Albatross material it occurs 

 from H4882, in 248 fathoms, in Colnett Strait. 



SPIROLOCULINA ACUTIMARGO H. B. Brady. 



Plate 5, fig. 1. 



Spiroloculina acutimargo H. B. Brady, Rep. Voy. Challenger, vol. 9, 1884, p. 

 154, pi. 10, figs. 12-15.— Bagg, Proc. U. S. Nat. Mus., vol. 34, 1908, p. 119. 



Description. — "Test oval, complanate, thin, slightly convex on 

 both sides; peripheral margin acute or carinate, extremities obtuse 

 or slightly rounded; chambers arcuate, angular, or carinate at the 

 outer margin, either slightly embracing or separated by the inter- 

 vening wing of the previous convolutions; aperture small, sometimes 

 in a produced tubular extension of the final segment. 



"Length, one-thirtieth inch (0.85 mm.)." 



Distribution. — The only recorded stations for this species in the 

 North Pacific are those given by Bagg off the Hawaiian Islands, 

 Albatross D4174, 735-865 fathoms, D4025, 275-368 fathoms, and 

 H4694, in 865 fathoms. 



