488 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



a thin periostracum that allows the banding to show through. The 

 nuclear whorls are marked with transverse wrinkles on all but the first 

 portion of the first turn. The postnuclear whorls are marked by 

 retractively slanting, threadlike, depressed, closely approximated lines 

 of growth, which extend from the summit to the umbilical chink. In 

 addition the whorls are marked by fine crisscross lines, cutting the 

 lines of growth obliquely, both protractively and retractively, but these 

 lines are very feebly expressed and scarcely perceptible, even under the 

 microscope. The base also usually presents fine, poorly developed, 

 closely spaced, incised, spiral lines. The aperture is large and broadly 

 oval. The peristome is reflected and brown, both on the outer lip 

 and the columellar side. The parietal wall is covered by a brown 

 callus. 



This species is represented by four races in our collection. The 

 typical one, coming from the Mount Halcon region, is conic in shape, 

 in which respect it resembles the small race whose habitat I am not 

 familiar with, while the other large race is more globose, with the 

 whorls more inflated and with stronger markings, and comes from the 

 Lake Naujan country. 



All three of these are chestnut-brown in ground color. The fourth, 

 coming from Mayabig, Baco, Mindoro, is almost of black ground color 

 on the last whorl, and all the whorls are darker. 



KEY TO THE SUBSPECIES OF COCHLOSTYLA (CHRYSALLIS) ROLLEI 



Ground color chestnut-brown. 

 Shell large. 



Shell elongate-ovate ; axial bands narrow r ollei 



Shell ovate; axial bands broad osborni 



Shell small vexator 



Ground color almost black nigra 



COCHLOSTYLA (CHRYSALLIS) ROLLEI ROLLEI Mollendorff 



Plate 110, Figure 6 



1892. Cochlostyla mindoroensis Pilsbry, Man. Conch., vol. 8, pp. 52-53, pi. 15, 



figs. 1, 2. 

 1898. Cochlostyla rollei Mollendorff, Abh. Naturf. Ges. Gorlitz, vol. 22, p. 146. 

 1901. Cochlostyla rollei Hidalgo, Obras malacologicas, pp. 546-547; in part. 

 1914. Cochlostyla rollei Mollendorff, Kobelt, and Winter, Semper's Reisen 



im Archipel der Philippinen, vol. 10, pp. 338-339, pi. 76, figs. 1-3. 



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



Sci., vol. 22, p. 340. 



1933. Helicostyla (Chrysallis) rollei Clench and Archer, Papers Michigan Acad. 



Sci., Arts, Letters, vol. 17, p. 552. 



Shell large, ovate. The early whorls are soiled flesh-color, those 

 succeeding turning chestnut-brown and streaked with irregular areas 

 of pale greenish yellow, hydrophanous, more or less interrupted axial 



