104 



BULLETIN 104, UNITED STATES NATIONAL MUSEUM. 



eastern coast of the United States. This variety occurs in the same 

 general region as the typical form, but is easily distinguished from 

 it. The surface is peculiarly smooth and uniform, the sutures, 

 though distinct, are neither raised above or depressed below the sur- 

 face, and the generally smooth polished character is continued over 

 all the chambers, and from the umbo to the periphery. 



Cristellaria occidentalis, var. glahrata — material examined. 



CRISTELLARIA OCCIDENTALIS, new species, var. NOVANGLIAE, new variety. 



Plate 23, fig. 1 ; pi. 24, fig. 1. 



Description. — Variety differing from the typical in the larger size 

 of the test, the broad keel extending nearly the whole circumference 

 of the test, showing lines of growth from each chamber, chambers 

 about 8 in the last-formed coil. 



Diameter up to 5 mm. 



Distribution. — Type-specimen (U.S.N.M, Cat. No. 18926) from 

 Albatross station D2237, in 520 fathoms (951 meters), southeast of 

 Nantucket. This is an abundant variety dredged by the Albatross 

 off the coast of New England. At first glance it might seem to be 

 quite different from Cristellaria occidentalism but a study of abun- 

 dant specimens shows that they probably belong to one species. 



Cristellaria occidentalis, var. novangliae — material examined. 



