478 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



being marked by closely spaced, flattened, threadlike riblets. The 

 entire surface of the shell is marked by numerous fine, oblique, 

 crisscross lines, which run obliquely across the lines of growth, both 

 protractively and retractively. Both of these elements are of about 

 the same strength and give to the surface a somewhat netted appear- 

 ance when viewed under the microscope. The aperture is somewhat 

 irregularly ovate, not infrequently oblique; the peristome is broadly 

 expanded and reflected on the outer and basal lips. The inner Up 

 is also broadly expanded, particularly so at the insertion of the 

 columella, where it is reflected and adnate to the base but leaves 

 behind its edge the umbilical chink. The parietal wall is glazed 

 by a moderately thick callus. 



The specimen described and figured (U.S.N.M. no. 104352) was 

 collected by Cuming and therefore comes from the northeastern 

 region of the island. It has 7.2 whorls and measures: Length, 70.6 

 mm; greater diameter, 31.2 mm. 



Another specimen (U.S.N.M. no. 104353), also of Cuming's collect- 

 ing, likewise has 7.2 whorls and measures: Length, 70.8 mm; greater 

 diameter, 31.2 mm. There are eight additional specimens before me 

 without specific localities. 



Two specimens (U.S.N.M. no. 20350a) were obtained by the U. S. 

 Exploring Expedition. These show considerable differences from those 

 just described for the northern race. It is more than likely that they 

 were obtained in the southern tip of Mindoro where the Exploring 

 Expedition collected. However, they are too decorticated to serve as 

 the basis for a description. The defining of the southern race will, 

 therefore, have to await the arrival of more material. 



COCHLOSTYLA (CHRYSALLIS) JAYI PERPUSILLA Bartsch 



Plate 109, Figure 8 



1932. Cochlostyla (Chrysallis) jayi perpusilla Bartsch, Journ. Washington Acad. 

 Sci., vol. 22, p. 340. 



The shell is cylindro-conic. Nuclear whorls buff. The early post- 

 nuclear whorls are very pale chestnut-brown; the last one is dark 

 chestnut-brown fulgurated with almost vertical broad hydrophanous 

 bands. The interior of the aperture and peristome are smoky bluish 

 white, the latter being edged with brown. The columella has the same 

 color scheme as the outer lip. The rest of the features are as in 

 typical Cochlostyla (Chrysallis) jayi jayi, except that the aperture in 

 the specimen before me seems more regular. 



The type (U.S.N.M. no. 313685) was collected by Mr. de Mesa at 

 Calawagan near Paluan, Mindoro. It has 7 whorls and measures: 

 Length, 64.7 mm; greater diameter, 28.6 mm; lesser diameter, 

 24.7 mm. 



