COCHLOSTYLA OF MINDORO PROVINCE 471 



1860. Chrysallis chrysalidiformis Martens, Albers, Die Heliceen, ed. 2, p. 179. 

 1892. Cochlostyla chrysalidiformis Pilsbry, Man. Conch., ser. 2, vol. 8, p. 51, 



pi. 14, fig. 64. 

 1895. Helicostyla chrysalidiformis Pilsbry, Man. Conch., ser. 2, vol. 9, p. 231. 



1897. Cochlostyla chrysalidiformis Hidalgo, Journ. Conchyl., vol. 44, pp. 247, 



263, 271, 322, 331, 340, 350. 



1898. Cochlostyla chrysalidiformis Mollendorff, Abh. Naturf. Ges. Gorlitz, 



vol. 22,p. 146. 

 1901. Cochlostyla chrysalidiformis Hidalgo, Obras malacologicas, pp. 550-551 



(in part), pi. 105, fig. 3; pi. 155, fig. 9. 

 1914. Cochlostyla (Chrysallis) chrysalidiformis Mollendorff, Kobelt, and 



Winter, Semper's Reisen im Archipel der Philippinen, vol. 10, pp. 



335-336, pi. 75, figs. 1, 2. 



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



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



1933. Helicostyla (Chrysallis) chrysalidiformis Clench and Archer, Papers 



Michigan Acad. Sci., Arts, Letters, vol. 17, p. 552. 



Shell elongate-ovate, with a thin, translucent, yellowish perios- 

 tracum, which is marked by axial hydrophanous streaks that extend 

 up to the summit of the whorls across the brown bands, where they 

 give to the shell an almost denticulated appearance. When the 

 periostracum is removed the shell is soiled flesh-color, and has a 

 moderately broad brown zone immediately below the summit and 

 this zone extends up to. the nuclear whorls to the very beginning of the 

 shell, becoming increasingly narrower. The peristome is fringed by a 

 pale purplish chocolate zone, which also marks more or less distinctly 

 the outer edge of the parietal callus. The interior of the aperture is 

 bluish white. Nuclear whorls 2.5, smooth, except a little frilling at 

 the summit; the postnuclear markings, particularly the hydrophanous 

 zones, carry over at least half of the nucleus. The postnuclear whorls 

 are moderately rounded, almost appressed at the summit, and marked 

 by low, rather broad, closely spaced, irregular, slightly retractively 

 curved, axial riblets, which give to the surface of the shell a rather 

 rough appearance. These riblets, or exaggerated growth lines, extend 

 over the base to the umbilical region. The periphery of the last whorl 

 shows as a decidedly obsolete angle. Aperture oval. Outer lip 

 rather strongly reflected, thin; the inner lip with a decided twist, 

 almost amounting to a tooth, expanding basally into a broad callus, 

 which is reflected over the base and extends over the parietal wall as a 

 thin callus. 



The specimen described and figured (U.S.N.M. no. 14354) is one 

 received from Cuming. It has 7.5 whorls and measures: Length, 

 69 mm; greater diameter, 30 mm. Another, bearing the same catalog 

 number, has 6.9 whorls and measures: Length, 62.7 mm; greater 

 diameter, 32 mm. 



In addition we have seven specimens and a young example, none of 

 which bears a specific locality: Two from the Jay collection (U.S.N.M. 



