486 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 41. 



inflated, well rounded, the latter narrowly umbilicated, smooth 

 excepting fine, incremental lines. Aperture very large, broadl}' oval, 

 almost circular; outer lip decidedly expanded, thin; columella 

 strongly curved and very slightly reflected; parietal wall covered 

 with a thick callus wliich renders the peritreme complete. 



The type (Cat. No. 213527, U.S.N.M.) has a little more than five 

 whorls and measures: length 5 mm., diameter 3.2 mm. In some 

 specimens of this species faint, spiral lines are apparent. 



Specimens examined. 



il=tjT)e. 

 CINGtJLA MARTYNI SCIPIO Dall. 

 Plate 41, figure 6. 

 Cingularobustascipio Dall, Proc. U. S. Nat. Mus., vol. 9, 1886, p. 306, pi. 4, fig. 10. 



Shell similar to martyni but more slender, with the spiral sculpture 

 usually more pronounced. 



The type (Cat. No. 213536, U.S.N.M.) has a httle more than five 

 post-nuclear whorls and measures: Length, 4 mm.; diameter, 2.2 mm. 



Specimens examined. 



Cata- 

 logue 

 No. 



56400 



1 213530 



213537 



213538 



213539 



83230 



Locality. 



St. Georges Island, Alaska 



Kyska Harbor, Aleutians, Alaska 



Chika Islands, Akutan Pass, Alaska (low water) 



Unalaska, Alaska 



East side Simeonoff Island, Shumagins, Alaska 



West side Middleton Island, Alaska (10 to 12 fathoms, gravel) 



Number 

 of speci- 

 mens. 



il=type. 



CINGULA ALASKANA, new species. 



Plate 41, figure 4. 



Shell subglobose, fight brown. Nuclear turns one and one-quarter, 

 well rounded, smooth excepting fine, incremental lines. Post-nuclear 



