COCHLOSTYLA OF MINDORO PROVINCE 



383 



at least the space immediately below it, is a light zone of varying width. 

 The periostracum on the base is usually lighter than on the upper 

 surface and is banded with lighter spiral zones of varying width. The 

 periostracum is darker brown, while the interior of the aperture is 

 bluish white. The nuclear whorls are about 2, depressed, moderately 

 well rounded, marked by lines of growth and the last portion of the 

 last turn by the beginning of fine incised spiral lines. The postnuclear 

 whorls are well rounded, appressed at the summit, and marked by fine 

 incremental lines and spiral striations. The latter are stronger on the 

 first postnuclear whorls than on the remaining turns. Periphery 

 obsoletely angulated. Base somewhat inflated, strongly rounded. 

 The aperture is broadly oval. The peristome is moderately strong, 

 expanded, and reflected; the inner lip is somewhat excavated and 

 gently curved. 



This species seems to be widely distributed over northeastern 

 Mindoro where it varies considerably in coloring and size. 



A series of 78 specimens yields the following measurements: 



