H(j THE NAUTILUS. 



It occurs in Massachusetts, New York and at Hamilton, Ontario, but I 

 have not seen this from the South or West. It is the size of typical 

 fulvus, the young of which must not be mistaken for mortoni. 

 Conulus fulvus alaskensis, n. var. 



Similar to C. fulvus but with only 4? whorls, the last one wider; 

 periphery a little angular in front, becoming well rounded ; columellar 

 insertion of the lip reflexed over the perforation, nearly or quite closing 

 it. Alt. 2.6, diam. 3.25 mm, Dyea valley and Point Romanoff, Alaska 

 (P. B. Randolph). 

 Conulus cheisinus (Say). 



This is very much elevated, the height of fully mature examples 

 exceeding the diameter, the general form being somewhat like that of an 

 immature Cerion . Outlines of spire quite convex ; whorls 62, appear- 

 ing very closely coiled, as seen from above, the last only faintly an- 

 gular, though in immature shells it is carinated. The base is quite 

 convex and the umbilical perforation very narrowly open. The lunate 

 aperture forms a less attenuated crescent than in the following va- 

 riety. Alt. 3, greatest diameter 2.8 mm. This form occurs from the 

 Sea Islands of Georgia to Florida, the specimen illustrated being from 

 Volusia county (coll. Pilsbry and Johnson, 1894). 

 Conulus chersinus trochulus (Reiubardt). 



Similar to the preceding, but lighter colored, less elevated (though 

 still high), the crescentic aperture narrower. Alt. 2.75, diam. 2.8 mm. 

 New Braunfels, Texas. Though near chersinus, this form is not dif- 

 ficult to distinguish, and will probably stand as a southwestern sub- 

 pecies. 

 Conulus chersinus polygyratus, n. v. 



Similar to the preceding, hut less elevated, with narrower aperture ; 

 whorls over 0. very narrow, the last one bluntly but decidedly an- 

 gular in front, the angle above the middle of the whorl, base peculiarly 

 sloping below the periphery; upper surface" with the lustre of silk; 

 base glossy, with a silky band around the outer margin. Alt. 2.2, 

 diam. 3 mm., sometimes larger. Color generally deep, brownish am- 

 ber. Hamilton, Ontario (associated with C. fulvus mortoni) ; Grand 

 Rapids, Michigan (with C. fulvus). Differs from typical chersinus 

 and trochulus chiefly in the peculiar form of the base, produced by 

 the high situation of the periphery, and the narrower aperture. The 

 numerous narrow whorls readily distinguish it from fulvus. 

 Conulus chersinus dentatus (Sterki). 



Rather small, with the narrow whorls of the species, the last whorl 



