COCHLITOMA. 95 



the spire rather coarse in close spiral series; the upper 

 part of the body-whorl similarly granulated, the lower por- 

 tion much more finely, the line of demarcation between the 

 two kinds of granulation sudden and distinct. The mouth 

 rather small, very irregularly oval, occupying a little more 

 than half the entire length of the shell, dirty-white or 

 bluish-white within, displaying the exterior reddish-brown 

 striping; columella arched in the middle, tortuous below and 

 abruptly truncated at the base, of a dirty-white color and 

 covered with a very thin callous which extends over the 

 whorl and joins the lip at its upper extremity." (Smith). 



Length 46, diam. 25, aperture 25 x 13.5 mm. 



South Africa (Smith). 



A. bisculpta SMITH, Quart. Journ. of Conch, i, p. 349 

 (May, 1878). ANCEY, Journ. de Conchyl. 1902, p. 280, fig. 8. 



"This interesting species must not be mistaken for the 

 young of A. welwitschi Morelet, to which it bears some re- 

 semblance. There are two specimens of it and apparently 

 not quite adult. I imagine, however, that they would not 

 grow much larger, but no doubt would become somewhat 

 more solid" (Smith). 



Ancey figures a shell which seems to him to be identical 

 with the type of A. bisculpta, but the general tint is paler 

 and there are no flammules (pi. 13, fig. 44). Mr. Smith's 

 type has not been figured. 



IV. Group of C. dimidiata. 



Ovate shells with the apex rather large and rounded, the 



spire decussate, last whorl mostly smooth and glossy; nearly 



uniform olivaceous, brownish or yellowish, usually with a 



few streaks in the direction of growth-lines, but without 

 flames or stripes. 



22. C. DIMIDIATA (E. A. Smith). PL 32, fig. 6. 



"Shell thin, light, divided into two differently colored por- 

 tions, the upper section above the middle of the body-whorl 

 being of a uniform dull-brown color and displaying very 

 little gloss on the surface, the lower division is polished and 



