COCHLOSTYLA OF MINDORO PROVINCE 427 



COCHLOSTYLA (COCHLODRYAS) FASTIDIOSA Bartsch 



Plate 99, Figure 5 



1840. Helix (Cochlogena) tenera Sowerby, Proc. Zool. Soc. London, 1840, p 102; 

 not Helix tenera Gmelin, Systema naturae, ed. 13, vol. 1, pt. 6, p. 3653, 

 1791, nor Helix tenera Hartmann, Neue Alpina, p. 232, 1821. 



1850. Helix tenera Pfeiffer, Martini-Chemnitz Conchylien Cabinet, ed. 2, 



vol. 1, Abt. 12, Theil 1, pp. 293-294 (in part), pi. 49, fig. 13. 



1851. Helix tenera Reeve, Conchologia iconica, pi. 16, fig. 62b. 



1892. Cochlostyla tenera Pilsbry, Man. Conch., ser. 2, vol. 7, pp. 179-180, 



pi. 36, fig. 32. 

 1897. Cochlostyla tenera Hidalgo, Journ. Conchyl., vol. 44, pp. 260, 320, 331, 



332, 341, 351. 

 1901. Cochlostyla tenera Hidalgo, Obras malacologicas, pp. 462-463 (in part), 



pi. 38, fig. 5. 

 1932. Cochlostyla (Cochlodryas) fastidiosa Bartsch, Journ. Washington Acad. 



Sci., vol. 22, p. 337. 



Shell varying in shape from helicoid to subglobular. Perfect 

 specimens are covered with a thin translucent periostracum, which 

 contributes largely to the coloration of the shell. The nucleus and 

 the first 1}{ postnuclear whorls are white; the remaining turns also 

 have a basal wliite ground color, but there is a narrow band of pale 

 grass green separated from the summit by a little narrow white 

 thread. The base also is pale grass green, and this color terminates 

 anteriorly in an intensification of this color in the shape of a moder- 

 ately broad zone at the periphery. The aperture, peristome, and 

 columella are white. The base too has spiral lines a little darker 

 than the rest. Nuclear whorls 2.2, well rounded, marked by lines 

 of growth, and the last half of the last turn bears within numerous 

 closely spaced spiral striations. The postnuclear whorls are inflated, 

 well rounded, appressed at the summit, and marked by retractively 

 curved lines of growth and numerous closely spaced spiral striations 

 both on spire and base. Periphery well rounded. The base is short, 

 inflated, and well rounded. The aperture is broadly oval; peristome 

 expanded and reflected. The columella is somewhat excavated. 

 Parietal wall covered by a thin translucent callus. 



The specimen described and figured (U.S.N.M. no. 313640), col- 

 lected by Dean C. Worcester and Bourns on the Menage Expedition 

 somewhere in northeastern Mindoro, has 5.1 whorls and measures: 

 Length, 27.8 mm; greater diameter, 26.3 mm; lesser diameter, 22.7 

 mm. 



We have a large series of specimens (U.S.N.M. no. 313641) from 

 the same source, a hundred of which yield the following additional 

 measurements: 



