COCHLOSTYLA OF MINDORO PROVINCE 



443 



spaces between which may be straw-color or tinged with orange- 

 brown. The interior of the aperture is bluish white, showing the exter- 

 nal bands within. The peristome may be white or slightly tinged with 

 brown. Nuclear whorls 2, well rounded, smooth except for incremental 

 lines. Postnuclear whorls very slightly rounded and appressed at the 

 summit, marked by feeble incremental lines and microscopic spiral 

 striations on both spire and base. Periphery obsoletely angulated; 

 base somewhat inflated, well rounded. Aperture subquadrate, oblique, 

 outer lip slightly expanded and reflected. Columella rather slender, 

 with a fold on its anterior third. 



The type (U.S.N.M. no. 313574) was collected by me on the summit 

 of Gunting Mountain, Loog Bay, Lubang Island. It has 5.3 whorls 

 and measures: Length, 40 mm; greater diameter, 27.2 mm; lesser 

 diameter, 24 mm. 



A series of additional specimens yields the following measurements: 



The yellow or orange-yellow coloration of the light areas in this 

 shell will distinguish it from the rest. It is interesting to find both 

 dark tips and light tips, and I am somewhat at a loss to account for 

 this. I visited Gunting Mountain on two succeeding days but com- 

 bined all my collections, and there is just the possibility that we may 

 have here a lumping of material that in reality represents two races. 

 The dark and light nuclei usually speak for phylogenetic stocks, and 

 the problem resulting therefrom had not presented itself at the time 

 of collecting. The field naturalist is all too prone to overlook important 

 features of this kind until he has had laboratory experience. 



