12 



33. Cyclostoma mordax. Shell much elongated ; pale brown, 

 often at the summit deep reddish brown, with several spiral series of 

 very small deep brown spots, of which those next below the suture are 

 the larger, and a somewhat interrupted band of the same around the an- 

 terior extremity ; with closely set much elevated sharp transverse lamel- 

 lae, which are slightly crenulated by numerous spiral impressed lines, 

 of wich one next below the suture is more deeply impressed ; spire 

 with scarcely convex outlines ; apex truncate with the loss of nearly 

 three whorls ; nearly five quite convex whorls remaining, with a well 

 impressed suture ; last whorl a little detached from the penult whorl 

 next the aperture ; aperture ovate-orbicular; lip simple, slightly spread, 

 reflected nearly into the plane of the aperture, more developed at the 

 angle above, and more advanced in the middle of the right side; um- 

 bilicus very small. 



Mean divergence 28° ; length .58 inch ; greatest breadth .32 inch ; 

 least breadth .25. 



34. Cyclostoma quinque-fasciatum. Shell much elongated ; 

 whitish with a faint tinge of brown, with — on the upper whorls three, 

 and on the last whorl five spiral series of very dark brown spots 

 which have pale brown shadows, the spots being also in inequidistant 

 transverse lines ; with rather distant smooth transverse ridges ; spire 

 with scarcely convex outlines ; apex truncate with the loss of nearly 

 four whorls ; five whorls remaining, with a moderately impressed 

 suture ; aperture ovate, subangulated at each end ; inner peritreme 

 thickened, white, appressed to the outer one, which is moderately 

 expanded, sinuate, reflected nearly to the plane of the aperture, much 

 expanded and concave above and also below on the left side, wanting 

 opposite the penult whorl ; umbilicus very small, nearly concealed by 

 the lip. 



Mean divergence 33°; length .77 inch ; greatest breadth .39 ; least 

 breadth .3 inch. 



35. Cyclostoma crenulosusi. Shell much elongated, conic ; 

 brownish, sometimes with transverse darker clouds and slender zigzag 

 spots, with a band of the same around the anterior part ; very coarsely 

 striated transversely, the upper ends of the raised lines being developed 

 into very numerous sutural crenulations, spiral lines wanting ; spire 

 with nearly rectilinear outlines ; apex truncate with the loss of three 

 whorls ; five whorls remaining, with a moderately impressed suture, 

 which is nearly concealed by the crenulations ; aperture ovate-orbicu- 

 lar ; inner peritreme orange red, on the right side coalescing with the 

 outer peritreme, which is white, moderately expanded, sharp, concave, 

 more produced and inflected above and at the lower end of the left 

 side; umbilicus very small. 



