1897.] NATURAL SCIENCES OF PHILADELPHIA. 367 



Aperture vertical ; parietal tooth very small, weak and short ; col- 

 uruellar fold distinct, extending inward one whorl. Peristome well 

 reflexed, whitish, rather thin or thickened ; parietal callus moderate 

 or very thin. 



Alt. 29, diam. of last whorl above aperture 11-12 ; alt. of aperture 

 11 mm. 



Alt. 285, diam. of last whorl above aperture 11 ; alt. of aperture 

 10 mm. 



Gun Cay, Bahamas (Dr. Wm. H. Rush, U. S. N.). 



The rather long and gradually tapering cone, smooth surface 

 above, the last one or two whorls ribbed, and very small parietal 

 tooth, are the most prominent features of this species. Its resem- 

 blance to C. regina eucosmium is remarkable ; but the small area 

 behind the columellar lip, with short rimation and rounded base, 

 distinguishes it at once from that form. It is superficially not far 

 from some of the Cayman Is. species, but has not the strong and 

 long parietal tooth of those forms. 



At the request of Dr. Rush this species is named in honor of 

 Lieutenant-Commander John Elliott Pillsbury, of the U. S. Coast 

 Survey Steamer " Blake." 



