COCHLOSTYLA OF MINDORO PROVINCE 491 



slanting, threadlike riblets, which give to the surface of the shell a 

 rather rough and somewhat shaggy appearance. There are also 

 indications of poorly expressed, fine, spiral striations, which are best 

 shown on the base. The fine zigzag sculpture is exceedingly minute. 

 Aperture oval ; outer lip moderately expanded and reflected ; the inner 

 lip partly expanded at its insertion where it flows into the parietal 

 callus. 



The type (U.S.N.M. no. 104348) was received from the Lea collec- 

 tion and is labeled Helix mindoroensis, without specific locality label. 

 It has 6.2 whorls and measures: Length, 57.7 mm; greater diameter, 

 30.8 mm. 



This is an exceedingly small race undoubtedly belonging to the 

 rollei complex. 



COCHLOSTYLA (CHRYSALLIS) ROLLEI NIGRA Bartsch 



Plate 110, Figure 2 



1932. Cochlostyla (Chrysallis) rollei niger Bartsch, Journ. Washington Acad. 

 Sci., vol. 22, p. 341. 



Shell huge, ovate. The early nuclear whorls are flesh-color, the 

 succeeding ones pale chestnut-brown, which is also the color of the 

 first two postnuclear whorls, the last one being very dark, almost 

 blackish, brown. The postnuclear whorls are covered by a rather 

 strong periostracum, which is marked by hydrophanous bands of 

 varying widths and shape, the pattern of the basal portion being 

 frequently quite different from that of the spire. The hydrophanous 

 markings are olivaceous-buff. The interior of the aperture is pale 

 blue; the peristome is very dark chocolate-brown, which is also the 

 color of the outer edge of the columella, the inner portion of the 

 columella gradually changing through smoky gray to bluish white 

 at its inner edge. Nuclear whorls 3, the first almost flattened, 

 moderately rounded, the succeeding turns moderately rounded and 

 marked by incremental lines, which gradually increase in strength. 

 The last whorl also shows incised spiral lines. The postnuclear 

 whorls are somewhat inflated, well rounded, appressed at the summit, 

 and marked by retractively curved, threadlike, incremental lines and 

 numerous rather strong incised spiral striations and the usual criss- 

 cross sculpture, which here also is somewhat intensified and present 

 on both spire and base. The suture is moderately impressed. The 

 periphery is obsoletely angulated. The base is inflated, strongly 

 rounded, and rather openly umbilicated. The aperture is broadly 

 oval; the outer lip is expanded and reflected. The inner lip also is 

 broadly expanded and reflected, half covering the umbilicus. The 

 parietal wall is covered by a rather thick callus. 



