FOKAMINIFERA OF THE NOETH PACIFIC OCEAN. 39 



Distribution. — The Challenger expedition obtained this species in 

 the North Pacific from the Chinese Sea and from the Honolulu coral 

 reefs in 40 fathoms. Bagg records it from one Albatross station near 

 the Hawaiian Islands, H 4566 in 572 fathoms. Rhumbler records it 

 from Laysan Island. 



The only station at winch I have had the species is Albatross D 4922 

 in Colnett or Vincennes Strait in 60 fathoms, bottom temperature 

 79.2° F. The bottom is given as coral in the records. This and the 

 adjoining stations are those from which many southern species were 

 found and where they apparently approach their northern limits in 

 this particular region. 



Genus NUMMULITES Lamarck, 1801. 



Nummulites Lamarck (type, N. laevigata Lamarck), Anirn. sans Vert., vol. 9, 

 1801, p. 101.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 

 p. 747. 



Description. — Test coiled, biconvex, usually bilaterally symmetrical, 

 composed of numerous volutions. The chambers numerous and ex- 

 tending to the umbo, each volution completely inclosing the pre- 

 ceding ones, the periphery often keeled, aperture a simple V-shaped 

 opening at the base of the apertural face of the chamber. 



The genus Nummulites is almost entirely represented by fossil 

 species but the genus still persists in the warmer seas of the Pacific 

 in comparatively shallow water. Our recent species are much less 

 complicated in their structure and smaller in size than the fossil ones. 



NUMMULITES CUMINGII (Carpenter). 

 Plate 14, fig. 6. 



Amphistegina cumingii Carpenter, Philos. Trans., 1859, p. 32, pi. 5, figs. 13-17. 

 Nummulites cumingii H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 



p. 749, pi. 112, figs. 11-13; woodcut, fig. 22.— Bagg, Proc. U. S. Nat. Mus., 



vol. 34, 1908, p. 166. 

 Nummulites radiata Bagg, Proc. U. S. Nat. Mus., vol. 34, 1908, p. 167. 



Description. — Test composed of several whorls, with about 20 

 chambers in the last-formed whorl, lenticular in cross section, about 

 2£ times as long as wide, surface smooth, umbonal portion with sutures 

 showing thickened bands at the surface, abruptly curved backward 

 near the periphery, surface between the sutures often with con- 

 spicuous pores; aperture simple, V-shaped. 



Diameter about 3 mm. 



Distribution. — Brady records this species from the Chinese Sea and 

 off the Philippine Islands in 95 fathoms. Bagg records it from four 

 Albatross stations off the Hawaiian Islands, D 4000 in 104-213 



