COCHLOSTYLA-CHRYSALLIS. 51 



Bulimus mercurius PFR., P. Z. S., 1852, p. 59; Monogr. iii, p. 

 340 ; Conchyl. Cab. p. 113, t. 35, f. 3, 4. 



Perhaps not a Cochlostyla, but without examining the type I am 

 unable to refer it to any other group. 



Section XVI. CHRYSALLIS Albers, 1850. 



Chrysallis ALB., Die Hel., p. 140 (part). v. MARTENS in Die Hel. 

 (2), p. 179, 1860, type C. chrysalidiformis Sow. 



Shell perforated, elongated ovate-conic, solid, opaque, not smooth ; 

 the aperture ovate, less than half the length of the shell; lip broadly 

 expanded ; columellar margin dilated and reflexed. Hydrophanous 

 cuticle generally present. 



Anatomy unknown. 



These shells resemble Prochilus in general contour and in having 

 the columella or axis of the shell actually perforated a character 

 in which they differ from all other sections of Cochlostyla except 

 certain forms of Corasia. The species of Chrysallis differ from 

 Prochilus in having the columella strongly folded above but not 

 truncated below ; in the rougher surface, dull coloring and the 

 possession of hydrophanous cuticle. 



The three known species of Chrysallis inhabit the island Mindoro. 

 They may be distinguished as follows : 



A. Parietal callus and columella porcelain- white, edged with dark 

 brown electrica. 



B. Parietal wall not pure white 



a. Body whorl well rounded; aperture nearly half the 

 length of shell mindoroensis. 



b. Body whorl laterally compressed ; aperture decidedly 

 less than half the length of shell chrysalidiformis. 



C. CHRYSALIDIFORMIS Sowerby. PI. 14, figs. 64, 65, 66, 67. 



Shell having a distinct crevice behind the columellar lip, but not 

 perforated; of an oblong-ovate or cylindrical form; solid. Typi- 

 cally straw-colored, with a brown sutural band spotted with white 

 and a brown peristome, but often clear buff with white lip, or 

 tawny-chestnut, conspicuously streaked with longitudinal white or 

 yellow stripes. Surface rather coarsely and irregularly wrinkled 

 by growth striae. 



