COCHLOSTYLA OF MINDORO PROVINCE 



511 



covers the surface of the shell, and this is streaked with retractively 

 slanting streaks, blotches, spots, and sometimes fulgurations of buff or 

 orange-buff. The base of the last whorl is always darker than the 

 posterior half of the turn. The aperture is white with a bluish tint 

 within. The peristome is very dark brown, almost black, with a 

 bluish reflection, the inner edge of the columella, particularly at its 

 insertion, tending to the same color as that of the aperture. The 

 parietal wall is covered by a dark callus. Nuclear whorls almost 3 ; 

 the first smooth, the rest gradually acquiring the sculpture of the 

 postnuclear turns. The postnuclear whorls are moderately rounded 

 appressed at the summit, and marked by retractively slanting lines of 

 growth and obsolete spiral striations and also by rather coarse micro- 

 scopic crisscross sculpture. The aperture is broadly oval; the peri- 

 stome is very broadly expanded and reflected. 



• Average. 



» Greatest. 



• Least. 



