504 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



lines. These also show the hydrophanous marks referred to under the 

 postnuclear sculpture. The postnuclear whorls are appressed at 

 the summit, moderately well rounded, and marked by threadlike lines 

 of growth, which vary much in strength and spacing, and also by 

 numerous, closely spaced, fine, incised spiral lines and the usual criss- 

 cross sculpture, which is present on both spire and base. The suture 

 is moderately impressed. The periphery is obsoletely angulated. 

 The base is comparatively short, inflated, and well rounded. The 

 aperture is broadly oval. The outer lip is strongly expanded and 

 reflected. The columella is also broadly expanded and reflected, 

 forming a narrow umbilicus. The parietal wall is covered by a rather 

 thick callus. 



This subspecies is the largest of the Cochlostyla (Chrysallis) aspersa 

 group. In size it suggests Cochlostyla (Chrysallis) rollei, from which 

 it can at once be distinguished by its dark apex. 



The type locality is on the west side of Mindoro. 



The type (U.S.N.M. no. 313702), collected by Pedro de Mesa at 

 Calamintao, Mamburao, Mindoro, has 5.5 whorls and measures: 

 Length, 64.4 mm; greater diameter, 34.4 mm; lesser diameter, 31.6mm. 



Fourteen topotypes (U.S.N.M. no. 313649) from the same source 

 yield the following measurements: 



'Average. Greatest. 'Least. 



COCHLOSTYLA (CHRYSALLIS) ASPERSA ASPERSA (Grateloup) 



Plate 112, Figures 1, 3 



1840. Bulimus aspersa Gratelotjp, Actes Soc. Linn. Bordeaux, vol. 11, p. 164. 

 1840. Bulimus aspersus Grateloup, Memoire sur plusieurs especes de coquilles 

 nouvelle ou peu connues de mollusques . . . , pp. 35-36, pi. 4, fig. 3. 



