54 . BULLETIN 104, UNITED STATES NATIONAL MUSEUM. 



Cjfclamm ina cancellata — malerwl examined. 



CYCLAMMEV^A COMPRESSA Cushman. 



Plate 11, fig. 1. 



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



p. Ill, fig. 171 (not figures 168-170). 

 Cyclammina compressa Cushman, Proc. U. S. Nat. Miis., vol. 51, 1917, p. 653. 



Description. — Test nautiloid, biconvex, compressed, i)eripheral 

 margin subacute, umbilicus often notably excavated; chambers 

 numerous, 14-lG in the last-formed coil, usually 15; sutures sub- 

 angular in the middle in side view, clearly depressed; surface smooth 

 when perfect; aperture and color as in (7. cancellata. 



Diameter, up to 3.5 mm. 



Distribution. — This species, originally described from 5G0 fathoms 

 off the Philippines, seems, like other species of the genus, to be wadely 

 distributed. Specimens have occurred at numerous stations in the 

 region from Cape Hatteras northw^ard to the Georges Banks with a 

 few stations in the eastern portion of the Caribbean Sea. The range 

 in depth is from 328 to 1,635 fathoms (600-2,990 meters) and 

 bottom temperatures where given 36.9° to 40.2° F. (2.7 to 4.5° C). 

 The stations at which it occurred in considerable numbers are be- 

 tween 500 and 1,000 fathoms (914 and 1,829 meters). 



