COCHLOSTYLA OF MINDORO PROVINCE 495 



lines present on spire and base, and the entire surface is marked by the 

 fine crisscross incised lines tbat cross the lines of growth obliquely. 

 The aperture is rather large, broadly ovate, almost subcircular, with 

 the peristome very broadly expanded and reflected. The peristome 

 of the inner lip is very broadly expanded and reflected over the umbili- 

 cus, which it leaves as a narrow chink. The parietal wall is covered by 

 a moderately thick callus. 



I am recognizing two subspecies: One from the northern end of the 

 island and the other from the southwestern part. The following key 

 will readily help to distinguish them : 



KEY TO SUBSPECIES OF COCHLOSTYLA (CHRYSALLIS) ANTONI 



Shell stout antoni 



Shell slender macilenta 



COCHLOSTYLA (CHRYSALLIS) ANTONI ANTONI Semper 



Plate 111, Figure 1 



1877. Cochlostyla antoni Semper, Reisen im Archipel der Philippinen, vol. 3, pt. 2, 

 p. 223. 



1891. Cochlostyla antoni Hidalgo, Obras inalacologicas, pp. 547-548, pi. 105, fig.l. 



1892. Cochlostyla chrysalidiformis antoni Pilsbry, Man. Conch., ser. 2, vol. 8, 



p. 52. 



1895. Helicostyla chrysalidiformis antoni Pilsbry, Man. Conch., ser. 2, vol. 9, 



p. 231. 



1896. Cochlostyla chrysalidiformis antoni Elera, Catalogo sistematico de toda la 



fauna de Filipinas, vol. 3, p. 611. 



1897. Cochlostyla antonii Hidalgo, Journ. Conchyl., vol. 44, pp. 263, 281. 



1898. Cochlostyla antoni M'ollendorff, Abh. Naturf. Ges. Gorlitz, vol. 22, p. 147. 

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



im Archipel der Philippinen, vol. 10, pp. 340-341, pi. 75, figs. 7, 8. 

 1932. Cochlostyla (Chrysailis) antoni antoni Bartsch, Journ. Washington Acad. 

 Sci., vol. 22, p. 341. 



Shell broadly ovate. The early whorls are white, gradually grading 

 into the pale yellow of the last turn, which on the base assumes prac- 

 tically a lemon shade. The postnuclear whorls are also crossed by 

 rather distantly spaced, hydrophanous, retractively slanting zones, 

 which become less conspicuous when the periostracum is worn away. 

 The interior of the aperture is white, which is also the color of the 

 broadly reflected peristome. Nuclear whorls 2.8, well rounded, 

 smooth, except the last turn and a half, which show fine incremental 

 lines. The postnuclear whorls are appressed at the summit, moderate- 

 ly rounded, marked by rather irregularly developed and spaced, retrac- 

 tively slanting, incremental lines and fine feebly incised spiral fines, 

 which are present on both spire and base. In addition there are pres- 

 ent microscopic, crisscross, incised spiral lines, which cross the lines of 

 growth obliquely. The periphery is well rounded, the base somewhat 

 inflated. Aperture large, very broadly oval; the peristome broadly 



