FORAMINIFEF.A OF THE PHILIPPINE AND ADJACENT SEAS. 251 



whorl; in face view subcarinate; apertural face unequal; sutures 

 ornamented by raised areas, obsolescent at the peripheiy, but gradu- 

 ally increasing in size toward the umbilical end, becoming in some 

 cases a distinct boss toward the umbilicus, those of the earlier whorls 

 fusing into a partial ring about the umbilicus; main surface of the 

 chambers smooth and unornamented; aperture radiate and project- 

 ing on the peripheral margin of the chamber. 



Diameter up to 3 mm. 



Distribution. — Type specimen (U.S.N.M. No. 9139) from Alba- 

 tross station D5272, in 118 fathoms (203 meters), China Sea, oS 

 southern Luzon, bottom temperature 57.4° F. (14.1° C). Besides 

 at the type station the species was obtained from the following Alba- 

 tross stations: D5113, in 159 fathoms (291 meters), China Sea, off 

 southern Luzon; D5282, in 248 fathoms (454 meters), also China 

 Sea, off southern Luzon, bottom temperature 47.4° F. (8.5° C.) ; 

 D5301, in 208 fathoms (381 meters), China Sea, off Hongkong, bottom 

 temperature 50.5° F. (10.2° C.) ; D5424, in 340 fathoms (622 meters), 

 Jolo Sea, bottom temperature 50.4° F. (10.2° C.) ; D5529, in 441 

 fathoms (812 meters), between Siquijor and Bohol, bottom temper- 

 ature 53° F. (11.7° C); D5570, in 330 fathoms (604 meters), north 

 of TawiTawi, bottom temperature 52.3° F. (11.2° C); and D5650, 

 in 540 fathoms (988 meters), Gulf of Boni, bottom temperature 40.1° 

 F. (4.5° C). 



This is a striking species, with its unequally biconvex form, the 

 difference in the two sides in regard to the length of the chambers 

 and the ornamentation. 



Cristellaria lielicina — Material examined. 



CRISTELLARIA HELICINOIDES Cushman. 



Plate 51, figs. 1 a, h. 



Cristellaria helicinoides Cushman", Proc. U. S. Nat. Mus., vol. 51, 1917, p. 661. 



Description. — ^Test uneqiially biconvex, especially in the later 



chambers; earlier chambers close-coiled, biconvex, numerous; later 



chambers becoming developed more strongly on one side of the axis 



