COCHLOSTYLA OF MINDORO PROVINCE 493 



later ones marked by growth lines. The postnuclear whorls are some- 

 what inflated, rather strongly rounded, narrowly shouldered at the 

 summit, and marked by retractively slanting lines of growth, which are 

 rather irregular and irregularly spaced. They are not quite threadlike. 

 The usual fine zigzag sculpture cuts these lines obliquely, both pro- 

 tractively and retractively, on both spire and base. The aperture is 

 rather large, oval. The outer lip is reflected and expanded; inner lip 

 also expanded, particularly at its insertion, where it is reflected over 

 the umbilicus leaving only a narrow open chink. The parietal wall is 

 covered with a moderately strong callus. 



This species is most nearly related to Cochlostyla rollei, from which it 

 differs in having the peristome white and the aperture larger and in 

 being much smaller. 



There are apparently two races before me, one specimen of which 

 was collected by Cuming and the other by Lieutenant Febiger. Neither 

 one bears locality data. 



KEY TO THE SUBSPECIES OF COCHLOSTYLA (CHRYSALLIS) ALBOLABRIS 



Shell ovate robusta 



Shell elongate-ovate albolabris 



COCHLOSTYLA (CHRYSALLIS) ALBOLABRIS ROBUSTA Bartsch 



Plate 111, Figure 5 



1932. Cochlostyla (Chrysallis) albolabris robusta Bartsch, Journ. Washington 

 Acad. Sci., vol. 22, p. 341. 



Shell moderately large, ovate, rather stout. Only the last two nu- 

 clear whorls remain, the first one being lost. The first postnuclear 

 whorl is buff with a narrow zone of brown ; the succeeding postnuclear 

 whorls are chestnut-brown, variegated with zones and figurations of 

 yellowish buff, which are, however, very poorly developed in this race, 

 showing best on the posterior half of the turns, the base being more or 

 less uniform brown. Aperture bluish white within. This coloration 

 also extends over the expanded peristome, but there is a very narrow 

 zone of brown bordering the outer lip and the columella. The post- 

 nuclear whorls are marked by rather strong, retractively slanting, 

 almost threadlike incremental lines, which give to the surface of the 

 shell a roughish appearance. These lines extend to the umbilical 

 chink in the last turn. They are crossed by the fine microscopic zig- 

 zag sculpture, on both spire and base. There are also indications of 

 feebly expressed fine spiral incised lines. The aperture very broadly 

 oval; the outer lip strongly expanded and reflected; the inner lip also 

 expanded — decidedly so at its insertion — where it is reflected over the 

 umbilicus, of which it leaves only a clunk. The parietal wall is covered 

 by a rather heavy glaze. 



