COCHLOSTYLA OF MINDORO PROVINCE 



513 



both spire and base. The basal portion of the last whorl is slightly 

 darker than the space posterior to it. The interior of the aperture is 

 pale bluish; the broadly expanded peristome is chocolate-brown at the 

 edge with a very strong iridescent bright bluish tinge on the inner half. 

 There is a wide bluish white triangular spot on the inner edge of the 

 columella at its insertion. Nuclear whorls 3 ; the first well rounded, 

 smooth, the rest marked by fine axial threads, which gradually develop 

 into the postnuclear sculpture. The postnuclear whorls are appressed 

 at the summit, moderately well rounded, and marked by irregular, 

 retractively slanting lines of growth, obsolete spiral striations, and the 

 usual crisscross sculpture both on spire and base. The aperture is 

 broadly oval. The peristome is strongly expanded and reflected both 

 on the outer lip and columella. In the latter place it almost covers the 

 umbilicus. The parietal wall is covered by a moderately thick callus. 



Average. 



> Greatest. 



• Least. 



1185— 3f 



