127 



tjurvilinear : whorls nearly seven, quite convex, with the suture 

 well impressed ; last whorl often somewhat flattened on the 

 middle : aperture subovate, with the columellar fold well de- 

 veloped, with the deposit on the inner side very thin ; labrum 

 sharp, not reflected, well thickened within. 



Mean divergence 45° ; length 1 inch ; breadth .5 inch ; 

 length of aperture .38 inch. 



Variety (?) lata has a divergence, in a specimen about 

 two-thirds grown, of 55°. 



Habitat, Sandwich Islands. 



This fine species is named in honor of Mr. Henry Dimond, 

 of Honolulu, to whom I have been much indebted for the 

 shells of these islands. 



AcHATiNELLA DECEPTA. Shell rather thick, ovate-conic, 

 much elongated : dingy white or very pale yellowish brown ; 

 with a dark brown or greenish epidermis, which is interrupted 

 more or less in transverse stripes, and often terminates ab- 

 ruptly on the periphery of the last whorl : with irregular 

 transverse striae ; without spiral striae : apex subacute : spire 

 long, with the outlines moderately curvilinear : whorls nearly 

 seven and one-half, rather convex, with a well impressed su- 

 ture ; last whorl rather small : aperture small, ovate ; lip 

 sharp, not expanded, moderately thickened within ; columel- 

 lar fold moderately developed. 



Mean divergence 38° ; length .72 inch ; breadth .33 inch ; 

 length of aperture .25 inch. 



This shell is figured by Mr. Reeve (Icon. f. 42 a, non 42 b) 

 as a variety of A. rubens Gould. We think it is entitled to 

 specific rank. It is usually more slender, and always more 

 conical and less ovate, the last whorl being shorter, and not so 

 regularly rounded, and the outlines of the spire being much 

 less curvilinear. A. rubens, always retaining its more regu- 

 larly rounded outlines, varies in its proportions in extreme 



