COCHLOSTYLA OF MINDORO PROVINCE 



499 



COCHLOSTYLA (CHRYSALLIS) ROSEOLABRA ROSEA Bartech 



Plate 111, Figure 3 



1932. Cochlostyla (Chrysallis) roseolabra rosea Bartsch, Journ. Washington Acad. 

 Sci., vol. 22, p. 341. 



Shell of medium size, ovate. The first two nuclear whorls are 

 flesh-color, the last one pale wood brown. The postnuclear whorls 

 are pale wood brown covered with a thin translucent pale-brown 

 periostracum, which is marked by buff, hydrophanous, retractively 

 slanting, axial bands and fulgurations that extend to the umbilical 

 area of the base. These bands vary in width and spacing in different 

 individuals. In some they are almost confluent. The aperture is 

 bluish white with a purplish tinge within. The outer lip is bright 

 rose-red, becoming more intense toward the outer edge. The same 

 holds true of the columella. Nuclear whorls almost 3; the first is 

 marked by fines of growth only, which become intensified until they 

 almost form threads on the last portion of the last nuclear whorl. The 

 nuclear spire is moderately acute. The postnuclear whorls are mod- 

 erately rounded, appressed at the summit, and marked by retractively 

 slanting, almost threadlike, axial lines of growth and feebly expressed 

 spiral striations and by fine crisscross sculpture, which cuts the lines 

 of growth obliquely. All these elements are present on both spire 

 and base. Suture moderately constricted. Periphery obtusely angu- 

 lated; aperture ovate. The outer lip is expanded and reflected; the 

 inner lip also expanded, particularly at its insertion, and reflected to 

 form the narrow umbilicus. The parietal wall is covered by a mod- 

 erately thick callus. 



The type (U.S.N.M. no. 313680), collected by Pedro de Mesa in 

 the interior of Abra de Hog, northwest Mindoro, has 6.3 whorls and 

 measures: Length, 49.3 mm; greater diameter, 26.4 mm; lesser 

 diameter, 22.6 mm. 



Five topotypes (U.S.N.M. no. 313681) yield the following addi- 

 tional measurements: 



i Average. 



' Greatest. 



» Least. 



