470 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



the shells with the brown subsutural band have the dark-colored 

 peristome. In the forms with the dark peristome the outer edge of the 

 parietal callus is also tinted with the same shade. The postnuclear 

 whorls are marked by irregular and irregularly developed, somewhat 

 retractively slanting, rather closely spaced, obsolete riblets, which 

 vary considerably in strength in the races here described. This 

 species is confined to the island of Mindoro. 



I am resurrecting Cochlostyla ustulata (Jay), as I have, in all the 

 material that I have seen, not found any intergrade between this and 

 Cochlostyla chrysalidiformis. Furthermore, the island of Mindoro 

 has so many races of other things geographically separated that I feel 

 certain that the forms of Cochlostyla chrysalidiformis, which I am here 

 recognizing, will be found to have a geographic basis. 



KEY TO THE SUBSPECIES OF COCHLOSTYLA (CHRYSALLIS) CHRYSALIDIFORMIS 



Summit of the whorls with a brown band. 



Shell elongate-ovate chrysalidiformis 



Shell cylindric mac r a 



Summit of the whorls without a brown band. 



Exterior of shell rough villosa 



Exterior of shell not rough. 

 Parietal wall straw-color. 



Shell thin, diaphanous rarior 



Shell not thin or diaphanous .enodosa 



Parietal wall brown fuscata 



COCHLOSTYLA (CHRYSALLIS) CHRYSALIDIFORMIS CHRYSALIDIFORMIS (Sowerby) 



Plate 108, Figure 5 



1833. Bulinus chrysalidiformis Sowerby, Proc. Zool. Soc. London, 1833, p. 37. 

 1833. Bulinus chrysalidiformis Sowerby, The conchological illustrations, pi. 30, 



fig. 28. 

 1836. Bulinus chrysalidiformis Muller, Synopsis . . . testaceorum viven- 



tium . . . , p. 26. 

 1838. Bulimus chrysalidiformis Deshayes, Lamarck's Histoire naturelle dea 



animaux sans vertebres, ed. 2, vol. 8, p. 278. 

 1841. Bulinus chrysalidiformis Broderip, Proc. Zool. Soc. London, 1840, p. 86; 



in part. 

 1848. Bulimus chrysalidiformis Pfeipfer, Monographia heliceorum viventium, 



vol. 2, p. 76. 

 1848. Bulimus chrysalidiformis Reeve, Conchologia iconica, pi. 4, fig. 16. 



1850. Bulimus (Chrysallis) chrysalidiformis Albers, Die Heliceen, ed. 1, p. 141. 



1851. Bulimus chrysalidiformis Deshayes, Ferussac's Histoire naturelle . . . 



mollusques . . . , vol. 2, pp. 56-57 (in part), pi. 149, figs. 10-11. 

 1855. Bulimus chrysalidiformis Pfeifper. Martini-Chemnitz Conchylien Cabinet, 

 ed. 2, vol. 1, Abt. 13, Theil 1, pp. 201-202, pi. 57, fig. 3. 



1855. Cochlostyla (Chrysallis) chrysalidiformis H. and A. Adams, The genera of 



recent Mollusca, vol. 2, p. 143. 



1856. Bulimus chrysalidiformis Pfeiffer, Malakozool. Blatter, vol. 2, p. 150. 



