236 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



the species was abundant. The species is a very comnaon one in the 

 Philippine Arcliipelago, being found also in the China Sea, but not 

 recorded in the areas to the south. It seems to be characteristic of 

 warm, not too deep water. Some of the general localities are as 

 follows: Off southern Luzon; east coast of Mindoro; off western 

 Bohol; Sogod Bay, southern Leyte; east of Masbate; between 

 Marinduque and Luzon; off northwestern Panay; Ragay Gulf, Luzon; 

 between Samar and Masbate; between Cebu and Bohol; Jolo Sea; 

 between Negros and Siquijor; and north of Tawi Tawi. 



The depth of these stations ranges from 30 to 554 fathoms (55 to 

 1,012 meters), the average being 215 fathoms (393 meters), and the 

 average bottom temperature 52.4° F. (11.3° C). 



The species differs from C. mamilligera Karrer in the keel, which 

 is entire and not regularly denticulate; the ornamentation, which 

 consists of raised ridges with bosses and not of a scries of knobs. 



Brady had material from the Philippines in 95 fathoms (174 

 meters). 



Cristellaria submamilligera — Material examined. 



CRISTELLARIA EXPANSA Cusliman. 



Plate 46, figs. 2a, b. 

 Cristellaria expansa Cushman, Proc. U. S. Nat. Mus., vol. 51, 1917, p. 658. 

 Description. — Test biconvex, with a very wide, prominent, very 

 thin keel; chambers with a large alar projection on the umbilical 



