FORAMINIFERA OF NORTH PACIFIC OCEAN. 



117 



AMMOBACULITES TENUIMARGO (H. B. Brady). 



Haplophragmium tenuimargo H. B. Brady, Proc. Roy. Soc. Edinburgh, vol. 11, 

 1882, p. 715; Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 303, pi. 33, figs. 

 13-16— Flint, Rep. U. S. Nat. Mus., 1897 (1899), p. 275, pi. 19, fig. 3. 



Description. — "Test elongate, crosier-shaped, much compressed; 

 lateral edges thin and jagged. Spiral segments few and small; those 

 of the linear series about six in number, broad and slightly convex; 

 septation obscure. Aperture simple, irregular in form; terminal. 

 Texture coarse, surface extremely rough." 



Length yV inch (2.5 mm.) or somewhat less. 



182 



183 



180 



181 



Figs. 180-183.— Ammobaculites tenuimargo. X 25 (after Brady). 180, 181, from side. 182, 



APERTURAL VIEW. 183, FROM EDGE, SHOWING THICKNESS OF TEST. 



Distribution. — Brady records this species from a single Challenger 

 station, No. 238, in 3,950 fathoms, east of Japan. I have seen no 

 specimens referable to this species in the material I have examined 

 from the North Pacific. 



AMMOBACULITES AMERICANUS, new species. 



Haplophragmium fontinenseH. B. Brady (not H.fontinense Terquem), Rep. Voy. 

 Challenger, Zoology, vol. 9, 1884, p. 305, pi. 34, figs. 1-4.— Goes, Bull. Mus. 

 Comp. Zool., vol. 29, 1896, p. 31. 



Description. — Test planospiral, compressed, slightly or not at all 

 involute, the two sides alike, composed of three or four volutions with 

 about nine chambers* in the outer volution, the last formed chambers 

 in fully grown specimens tending to form an uncoiled straight growth, 

 wall made up of sand grains firmly cemented; aperture elongate, oval, 

 or forming a long slit across the apertural face of the chamber; color, 

 gray. 



