FORAMINIFERA OF THE NORTH PACIFIC OCEAN. 



17 



Description. — Test dorsally convex, concave below; chambers two 

 to four in final whorl, elongate; peripheral border acute, keeled some- 



FlG. 18.— DlSCORBIS ORBICULARIS (TERQITEM). X 100. a, DORSAL VIEW; 6, SIDE VIEW; 

 C, VENTRAL VIEW. (AFTER BRADY.) 



times- sutures either marked by fine lines or considerably limbate; 

 ventral side with but three to five chambers visible; wall punctate. 



Diameter, 0.50-0.84 mm. 



Distribution. — I have had specimens of 

 this species from off Hakodate, Japan, and 

 from Albatross station D4875 in 59 fathoms, 

 eastern channel of Korea Strait and from 

 D4949 in 110 fathoms off Japan. This spe- 

 cies had apparently not previously been 

 recorded from the North Pacific. 



DlSCORBIS PATELLIFORMIS (H. B. Brady). 



Plate 5, fig. 5. 



Discorbina patelliformis H. B. Brady, Rep. Voy. 

 Challenger, Zoology, vol. 9, 1884, p. 647, pi. 

 88, figs. 3a-c; pi. 89, figs. la-c. — Egger, Abb., 

 kon. bay. Akad. Wiss. Munchen, CI. ii, vol. 

 18, 1893, p. 390, pi. 15, figa. 48-50.— Mil- 

 lett, Journ. Roy. Micr. Soc, 1903, p. 700. — 

 Rhtjmbler, Zool. Jahrb., Abt. Syst., vol. 24, 

 1906, p. 68. 



Description. — Test free ; superior side con- 

 ical, inferior flat, peripheral edge acute; in 

 the adult state composed of fully three con- 

 volutions, of which the outermost has from 

 five to seven segments; segments in their 

 superior aspect long and narrow, the su- 

 tures and margin marked by broad lines of 

 clear shell substance, but not linibate externally. Superior surface 

 smooth; inferior ornamented either with faint riblets radiating from 



FlG. 19.— DlSCORBIS PATELLrF0RML<3 



(H.H.Brady). X 100. o, dorsal 

 view; 6, side view; c, VENTRAL 

 view. (After Brady.) 



