FOEAMINIFERA OF THE NORTH PACIFIC OCEAN. 



69 



Description. — Test unequally biconvex, dorsal side flattened but 

 unbonate in the middle, somewhat depressed toward the periphery, 

 ventral side strongly convex, umbilicate; peripheral margin rounded ; 

 sutures distinct but not depressed; 10-12 

 chambers in the final whorl; wall smooth; 

 aperture a narrow slit toward the peripheral 

 margin on the ventral side. 



Diameter 0.75-1 mm. 



Distribution. — Brady records this species 

 from the North Pacific in 224 to 1,850 fath- 

 oms. Flint records it from Albatross station 

 D30S0 in 93 fathoms off the coast of Oregon. 

 I have failed to find specimens referable to 

 this species. 



ROTALIA CALCAR (d'Orblgny). 

 Plate 28, fig. 2; plate 29, fig. 2. 



Calcarina calcar d'Orbigny, Ann. Sci. Nat., vol. 7, 



1826, p. 276, No. 1; Modeles No. 34; in De la 



Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, " Forarni- 



niferes," p. 93, pi. 5, figs. 22-24. — Carpenter, 



Parker, and Jones, Introd. Foram., 1862, p. 223, 



pi. 13, fig. 21. 

 Kotalia calcar H. B. Brady, Rep. Voy. Challenger, 



Zoology, vol. 9, 1884, p. 709, pi. 108, fig. 3, fig. 4?— 



Egger, Abh. kon. bay. Akad. Wiss. Miinchen, 



CI. ii, vol. 18, 1893, p. 423, pi. 19, figs. 1-3.— Mil- 



lett, Journ. Roy. Micr. Soc, 1904, p. 506.— 

 Micr. Club, ser. 2, vol. 10, 1907, p. 140; Proc. Roy. Soc. Victoria, vol. 22, 



1910, p. 289, pi. 3, fig. 2. 



Description. — Test biconvex, composed of numerous chambers with 

 about 10 chambers in the final whorl; sutures limbate both ventrally 

 and dorsally. The peripheral border of each chamber extending out 

 into a spine, central part of the test dorsally with numerous raised 

 tubercles; aperture a narrow, simple slit running ventrally from near 

 the periphery nearly to the umbilicus. 



Diameter up to 1.35 mm. 



Distribution. — This species seems not to have been previously 

 recorded from the North Pacific. I have had a few specimens from 

 Hong Kong Harbor and from Cebu, Philippines, the latter collected 

 by Dr. E. A. Mearns. Its distribution is apparently limited to the 

 shallow waters of tropical and subtropical regions. 



FIG. 62.— ROTALIA ORBICULARIS 



d'Orbigny. X 50. a, dor- 

 sal view; 6, side view; c, ven- 

 tral view. (Adapted from 

 Brady.) 



-Chapman, Journ. Quekett 



