COCHLOSTYLA OF MINDORO PROVINCE 



437 



Shell broadly ovate-conic. Early whorls white. The early post- 

 nuclear whorls show a reddish-brown band at the summit that increases 

 in intensity as the shell progresses in size, but even on the last turn 

 it is but pale brown. There is also a fairly broad peripheral zone of 

 brown, which shows in the suture on the last two whorls. This band 

 is flanked posteriorly and anteriorly by a reddish-brown suffusion, 

 which on the base sometimes extends almost entirely over it. The 

 umbilical area is likewise marked with a zone of reddish brown 

 corresponding in intensity with the peripheral band. The band at 

 the summit and at the periphery and on the base of the last turn 

 shows axial hydrophanous lines, which give a somewhat vertebrated 

 appearance to the band at the summit and the periphery. The 

 interior of the aperture and columella is bluish white, while the outer 

 lip is edged with brown. Nuclear whorls about 2, well rounded, 

 marked by lines of growth only. The postnuclear whorls are slightly 

 rounded and marked by rather strong retractively curved lines of 

 growth, which assume almost a threadlike appearance. They become 

 somewhat enfeebled on the base. In addition to this the entire 

 surface of the shell is marked by fine, closely spaced, spiral stria tions. 



