468 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



COCHLOSTYLA (PROCHILUS) FICTILIS AMBULONENSIS Bartsch 



Plate 107, Figure 3 



1901. Cochlostyla fictilis Elera, Catalogo sistematico de toda la fauna de Filipinas, 



vol. 3, p. 609; in part. 

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



im Archipel der Philippinen, vol. 10, pp. 334-335 (in part), pi. 73, figs. 



15, 16. 

 1932. Cochlostyla (Prochilus) fictilis ambulonensis Bartsch, Journ. Washington 



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



Shell small, spindle-shaped, covered with a thin periostracum, which 

 varies apparently in its color scheme, being in the hydrophanous areas 

 pale straw-yellow. In the darker area it is either transparent or 

 partakes of the dark portion of the subadjacent shell. Interior of 

 aperture, the expanded outer lip, columella, and parietal callus white. 

 Nuclear whorls 1.7, forming a slender apex, marked only by lines of 

 growth. Postnuclear whorls rather high between the summit and 

 suture, appressed at the summit, slightly rounded, and marked by 

 retractively slanting lines of growth and rather strong and rather 

 distantly spaced incised spiral lines, which are present on both spire 

 and base. Suture moderately constricted. Periphery well rounded. 

 Base produced, moderately rounded. Aperture very elongate-ovate. 

 Outer lip broadly expanded, particularly basally, and reflected. The 

 inner lip broadly expanded and reflected, forming the narrow um- 

 bilicus. Parietal wall covered by a thick callus, which, while trans- 

 lucent, nevertheless shows whitish. 



The type (U.S.N.M. no. 313600), collected by Quadras on Ambulon 

 Island, has 6.1 whorls and measures: Length, 36.7 mm; greater di- 

 ameter, 14.9 mm. 



U.S.N.M. no. 313601, from the same source, has 6.5 whorls and 

 measures: Length, 39.7 mm; greater diameter, 16.4 mm. 



Still another (U.S.N.M. no. 104349), from the Cuming collection, 

 without definite locality, has 5.5 whorls and measures: Length, 38.8 

 mm; greater diameter, 16.2 mm. 



COCHLOSTYLA (PROCHILUS) FICTILIS CAGURANA Bartsch 



Plate 107, Figure 2 



1932. Cochlostyla {Prochilus) fictilis cagurana Bahtsch, Journ. Washington 

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



Shell spindle-shaped. The early whorls white, gradually passing 

 through pale buff and darker buff into brown, the last whorl being 

 dark chestnut-brown except for a broad zone of white near the summit. 

 The peristome, columella, and interior of aperture are white. In 

 addition to this the shell is marked by broad axial zones of white. 

 Nuclear whorls 2, rather high, forming a rather pointed apex. Post- 

 nuclear whorls high between the summit and suture, appressed at the 



