NATURAL SCIENCES OF PHILADELPHIA. 231 



the spire ; spire moderatel}'^ elevated, acutely conical ; whorls em- 

 brj^oual 3, light-brown, wrinkled, normal whorls 4-5, convex, last 

 one rather long, tapering at the base ; whole surface decussated 

 by fine crowded longitudinal and transverse elevated lines, which 

 are minutel}'' granulated at their points of intersection ; aperture 

 narrow elliptical, nearly half the length of the shell ; sinus large 

 and deep ; peristome rather thick, finely crenulate, and slightl}'' 

 sinuous near the base; columella smooth, nearly vertical. 

 Length 10 mill. 



Hah. Paumotus Isles. (Coll. Phil. Acad. Nat. Scinccs.) 

 We found about a dozen examples of this species washed up on 

 the beaches, all of which have the peculiar tessellations. In shape 

 and sculpturing it closely resembles D. millegrana, but is more 

 contracted at the base. 



