CHLOEOSTOMA. 187 



columella short, arcuate, with a white callus above and two transverse 

 tubercles at base. Alt. 14, diam. 16 mill. 



West Indies; Florida Keys ; Bermuda. 



T. earneolus Lam., An. s. Vert., vii, p. 29. — Fischer, Coq. Viv., 

 p. 195, t, 63, f. 2.— T. fasdatm Born, Mus. Cces. Vindob., p. 331, t. 

 12, f. 3, 4.—T. deiitatus Gmel., Si/st. Nat., xiii, p. 3601. 



An abundant West Indian species, differing from other Omphalius 

 by the smooth surface. The name imposed by Born had better be 

 retained, as there is no doubt about the identity of his rigures and 

 description with the present species. 



C, suBSTRiATUM Pilsbry. PI. 29, figs. 78. 



Much more depressed than C. carneola, discoidal, widely umbil- 

 icate ; surface sculptured by numerous spiral slightly elevated 

 lirulte, which are red, more or less articulated with white dots ; 

 periphery frequently with two or several more prominent lirse. 



Alt. 6, diam. 10 mill. 



Bahamas; St. Croix. 



C. EXCAVATUM Lamarck. PI. 63, figs. 3, 4, 5. 



Shell umbilicate, conical, dull grayish, olivaceous or pinkish, 

 longitudinally lineolate with a darker shade, frequently appearing 

 unicolored ; spire conic, apex eroded or acute ; whorls 6 to 7, flat- 

 tened, scarcely convex, ver}' obsoletely spirally grooved ; body-whorl 

 acutely carinated at the periphery, flat or plano-concave beneath, 

 concentrically lirate ; aperture large, subhorizontal, iridescent within ; 

 columella sinuous, unidentate in the middle, green, half surrounding 

 the umbilicus with a sickle-shaped callus ; umbilicus infundibuliform, 

 green or white within, broadly expanding at its opening. 



Alt. 12-14, diam. 15 mill. 



West Indies. 



T. ezcavatus Lam., A^i. s. Vert., vii, p. 29. — Philippi, Conchyl. 

 Cab., p. 151, t. 25, f 1 ; t. 28, I 12.— Fischer, Coq. Viv., p. 283, t. 

 92, f 3. 



Distinct from all other West Indian species in the conical form, 

 flat base and more oblique aperture. 



C. GRUENTUS Philippi. PI. 63, figs. 6, 7. 



The present species is very distinct in its sculpture. There are 7 

 whorls, ending in an acute apex, and very convex. The upper ones 

 have 6 concentric lirit, which appear quadi-ate in section, often above 



