FORAMINIFERA OF THE NORTH PACIFIC OCEAN. 5 



usually rounded; wall covered with a secondary deposit of calcareous 

 material obscuring the sutural depressions of all but the final coil, 

 ornamented over the whole exterior with numerous raised tubercles 

 usually more prominent on the dorsal face; aperture somewhat 

 crescentic. 



Diameter 0.5 to 1 mm. 



Distribution. — Brady gives the only North Pacific record for this 

 species. It was obtained by the Challenger off the coral reefs of 

 Honolulu, Hawaiian Islands, in 40 fathoms. Bagg does not record 

 it from this region, but his material, as was that which I have had, 

 came from deeper water. Apparently from Brady's figures of this 

 species h$ had both microspheric and megalospheric forms of the 

 species. 



SPIRILLINA LIMBATA H. B. Brady. 

 Plate 2, figs. 1, 2. 



Spirillina limbata H. B. Brady, Quart. Journ. Micr. Sci., vol. 19, 1879, p. 278, 



pi. 8, fig. 26a, b; Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 632, pi. 85, 



figs. 18-21. — Egger, Abh. kon. bay. Akad. Wiss. Munchen, CI. n, vol. 18, 



1893, p. 395, pi. 18, figs. 43, 44.— Flint, Rep. U. S. 



Nat. Mus., 1897 (1899), p. 326, pi. 71, fig. 5.— Millett, 



Journ. Roy. Micr. Soc, 1903, p. 694. 



Description. — Test planospiral, concave on 

 both sides or merely flattened, composed of 

 numerous regular coils; peripheral border 

 ^ square; wall smooth, the sutural line marked 

 fig. o.-spmnxiNA limbata h.b. h J a raised ridge of calcareous material, per- 

 brady. x 60. a, front view; f orations small and inconspicuous ; aperture 



F ROM E B T R U A E D A Y L r V - (ADAPTED somewhat compressed. 



Diameter 0.42-0.85 mm. 

 Distribution. — In the Challenger report Brady records this species 

 as occurring at one Challenger station in the North Pacific, but does not 

 give depth or location. 



SPIRLLLINA LIMBATA H. B. Brady, var. DENTICULATA H. B. Brady. 

 Plate 3, figs. 1, 2. 



Spirillina limbata H. B. Brady, var. denticulata H. B. Brady, Rep. Voy. Chal- 

 lenger, Zoology, vol. 9, 1884, p. 632, pi. 85, fig. 17. 



Description. — Test very similar in general to that of typical S. lim- 

 bata, but differing in the denticulate character given to the carina of 

 the margin of the chamber by the buttress-like teeth which border it 

 along the inner side. 



Distribution. — This variety was described from the East Indian 

 region by Brady, but has not previously been recorded from the North 

 Pacific. I have had it from stations which have shown by their 



