FORAMIIsriFERA OF THE PHILIPPINE AND ADJACENT SEAS. 85 



Diameter up to 6.5 mm. in the microspheric form, averaging in 

 the commoner megalospheric form 3 to 4 mm. 



Distribution. — This species was found very abundantly at some 

 stations: East coast of Mindanao; east coast of Luzon; China Sea; 

 Jolo Sea; Molucca Passage; Patiente Strait; and Gulf of Boni. 

 These stations range in depth from 208 to 940 fathoms (381 to 1,719 

 meters), the average being 560 fathoms (1,065 meters). Bottom 

 temperatures range from 36.7° F. to 53° F. (2.6° C. to 11.7° C), the 

 average beuig 46.3° F. (7.8° C.) 



This species may be characterized by the broadly rounded periph- 

 eral margin, the number of chambers averaging 13 to 15. The 

 rotund tumid character of the test as a whole will distinguish it at 

 once from any of the following. Both microspheric and megalo- 

 spheric forms occur in this species and are similar except in size. 



Cyclamviina cancellata — Material examined. 



CYCLAMMINA COMPRESSA Cushman. 



Plate 16, figs. 2a, b. 



Cyclammina cancellata (part) Cushman, Bull. 71, U. S. Nat. Mus., pt. 1, 1910^ 



p. Ill, fig. 171 (not figa. 1G8-170) (in text). 

 Cyclammina compressa Cushman, Proc. U. S. Nat. Mus., vol. 51, 1917, p. C53. 



Description. — Test nautiloid, biconvex, compressed peripheral 

 margin subacute, umbilicus often notably excavated; chambers 

 numerous, 14 to 16 in the last-formed coil, usually 15; sutures 

 subangular in the middle in side view, clearly depressed, surface 

 smooth when perfect; aperture and color as in G. cancellata. 



Diameter up to 3.5 mm. 



Distribution. — Type specimen (U.S.N.M. No. 9105) from Albatross 

 station D5470, in 560 fathoms (1,065 meters) off the east coast of 

 Luzon. It was noted at numerous stations in the same locality, one 



