COCHLOSTYLA OF MINDORO PROVINCE 473 



COCHLOSTYLA (CHRYSALLIS) CHRYSALIDIFORMIS VILLOSA Bartsch 



Plate 108, Figure 2 



1841. Bulinus chrysalidiformis var. d Broderip, Proc. Zool. Soc. London, 1840, 



p. 86. 

 1892. Cochlostyla chrysalidiformis Pilsbry, Man. Conch., ser. 2, vol. 8, ]>. 52 (in 



part), pi. 14, fig. 65. 

 1901. Cochlostyla chrysalidiformis var. D Hidalgo, Obras malacologicas, p. 551, 



pi. 105, fig. 4. 

 1932. Cochlostyla (Chrysallis) chrysalidiformis villosa Bartsch, Journ. Washington 



Acad. Sci., vol. 22, p. 339. 



Shell elongate-ovate. The early whorls are white, the later whorls 

 covered with a pale straw-colored periostracum, which is crossed at 

 more or less regular intervals by axial hydrophanous bands. The base 

 is colored like the preceding portion of the last turn. Aperture and 

 peristome white. Nuclear whorls 2.2, well rounded, smooth except 

 for a few lines of growth. The postnuclear whorls are moderately 

 rounded, appressed at the summit, and marked by rather rough, some- 

 what wrinkled, flattened, axial riblets, which are of irregular strength 

 and spacing and extend to the umbilical chink. Suture slightly con- 

 stricted. The periphery is feebly obsoletely angulated. Aperture 

 auricular; the outer lip broadly expanded and reflected; the inner lip 

 also broadly expanded at its insertion and reflected over the umbilicus, 

 extending as a thin callus over the parietal wall. 



The type (U.S.N.M. no. 315858) comes from the Evezard collection 

 and is labeled merely "Philippines." It probably belongs in north- 

 eastern Mindoro. It has 7.1 whorls and measures: Length, 66.8 mm; 

 greater diameter, 31.2 mm. 



This shell in general shape and sculpture resembles most nearly 

 typical Cochlostyla chrysalidiformis chrysalidiformis, being a little 

 rougher in sculpture and lacking the dark colored band at the summit 

 and the dark edge to the lip. It can be distinguished from Cochlostyla 

 chrysalidiformis enodosa by its larger size, more elongate form, and 

 stronger sculpture. 



COCHLOSTYLA (CHRYSALLIS) CHRYSALIDIFORMIS RARIOR Bartsch 



Plate 108, Figure 4 



1932. Cochlostyla (Chrysallis) chrysalidiformis rarior Bartsch, Journ. Washington 

 Acad. Sci., vol. 22, p. 339. 



The shell is very thin, diaphanous, elongate-conic, pupiform. The 

 early whorls and the interior of the aperture and peristome are milk 

 white. The postnuclear whorls are covered with a thin, translucent, 

 yellowish periostracum, which is marked by pale buff, retractively 

 slanting, figurations. Nuclear whorls 3, forming a moderately 

 elevated apex, marked by retractively slanting lines of growth, which 

 are strongest on the last turn where they render the summit slightly 



