240 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



The typical form, consisting of a compressed test, close-coiled, with 

 a few chambers, a rather acute peripheral border, and an ornamenta- 

 tion consisting of raised costal lines on the limbate sutures, with an 

 independent set of costae between and running more nearly in the 

 axis of growth. In the typical form these two sets of costae are 

 more or less evenly balanced, as in the figure given by Brady (pi. 71, 

 fig. 9) and as shown here. 



The typical form of the species as here selected occuiTed at a num- 

 ber of stations in the area within the Archipelago proper; off Rom- 

 blon; Sogod Bay, southern Leyte; at several stations off Marinduque 

 Island; off northwestern Panay; and China Sea, off southern Luzon. 



The stations range in depth from 50 to 654 fathoms (91 to 1,012 

 meters), with the average 215 fathoms (393 meters). The only two 

 stations at which bottom temperatures were taken are 49.3° F. and 

 52.8° F. (9.6° C. and 11.5° C). 



Cristellaria costata — Material examined. 



CRISTELLARIA COSTATA (Fichtel and Moll), var. MULTICOSTA Cushman. 



Plate 47, figs. 2, 3. 



Cristellaria costata (Fichtel and Moll), var. multicosta Cushman, Proc. U. S» 

 Nat. Mu3., vol. 51, 1917, p. 658. 



Description. — Variety very much compressed, complanate, with 

 the costae along the limbate sutures obsolete, the sutures slightly 

 depressed; the ornamentation of each chamber consisting of a large 

 number of fine raised costae spreading fan-like from the aperture as 

 a center backward and covering the entne surface of the chamber; 

 aperture radiate, protruded. 



Diameter up to 4 mm. 



Distnhution. — Type specimen (U.S.N.M. No. 9130) from Albatross 

 station D5538, in 256 fathoms (468 meters), between Negros and 

 Siquijor, bottom temperature 53.3° F. (11.8° C). Besides at the 

 type station well-marked specimens of this variety have occurred at 

 Albatross station D5178, in 78 fathoms (143 meters), off Romblon; 

 D5259, in 312 fathoms (571 meters), off northwestern Panay, bottom 



