COCHLOSTYLA OF MINDORO PROVINCE 467 



(Prochilus) Jictilis jictilis (Broderip) and Cochlostyla (Prochilus) jictilis 

 larvata (Broderip) come from Cuyo Island, which is one of the elements 

 of the northern Calamian group. 



The three subspecies that I am here describing come from the south- 

 western tip of Mindoro, southeastern part of Mindoro, and the Island 

 of Ambulong immediately southwest of Ilin Island, also adjacent to 

 Mindoro. 



KEY TO THE SUBSPECIES OF COCHLOSTYLA (PROCHILUS) FICTILIS IN MINDORO 



PROVINCE 



Shell yellow fulva 



Shell not yellow. 

 Shell brownish. 



White band at summit very narrow ambulonensis 



White band at summit very broad cagurana 



COCHLOSTYLA (PROCHILUS) FICTILIS FULVA Bartsch 



Plate 107, Figures 6-7 



1914. Cochlostyla (Prochilus) larvata M Ollendorff, Kobelt, and Winter, Sem- 

 per's Reisen im Archipel der Philippinen, vol. 10, p. 332 (in part), pi. 73, 

 figs. 11, 12. 



1932. Cochlostyla (Prochilus) jictilis fulva Bartsch, Journ. Washington Acad. Sci., 

 vol. 22, p. 339. 



Von Mollendorff, Kobelt, and Winter described and figured, under 

 the name Cochlostyla (Prochilus) larvata, a shell in the following terms: 



"Shell small, subperforate, subfusiform, pyramidal, quite solid, 

 shining, nearly smooth, yellowish, subunicolor, or ornamented with 

 pale oblique distant streaks. Spire pyramidal, turreted; apex some- 

 what obtuse. Whorls 6, nearly flattened, slightly increasing. Suture 

 slightly impressed, the last whorl equaling two-fifths of the entire 

 length of the shell, slightly descending anteriorly. Base attenuated. 

 Aperture narrow, oblong, oval, compressed at the base, white within. 

 Peristome thickened, white, with partly expanded margin. Parietal 

 callus very thin, translucent but well defined externally; it does not 

 render the peristome complete. The external margin of the peristome 

 is broadly expanded, thickened, white, joining the columella with the 

 posterior angle of the aperture." The measurements given by these 

 authors are: Altitude 32.5 mm; diameter, 19 mm. Altitude of aper- 

 ture with peristome, 14 mm; diameter, 10 mm. 



They cited southeast Mindoro as the type locality and stated that 

 the specimen figured is considerably smaller than the typical race, 

 that it appears to be almost unicolor, except for a very small remnant 

 of the basal columellar dark area, but that it has the characteristic, 

 almost spindle, shape of the type. 



I have not seen specimens of it and have given a free translation of 

 the Latin diagnosis and a copy of their figure. 



