COCHLOSTYLA OF MINDORO PROVINCE 381 



1890. Cochlostyla aegrota Pilsbry, Man. Conch., ser. 2, vol. 6, p. 124 (in part), 



pi. 26, fig. 1. 



1891. Helix aegrota Hidalgo, Obras malacologicas, pi. 21, fig. 8. 

 1895. Helicostyla aegrota Pilsbry, Man. Conch., ser. 2, vol. 9, p. 219. 



1898. Cochlostyla aegrota Mollendorff, Abh. Naturf. Ges. Gbrlitz, vol. 22, p. 



105. 

 1908. Cochlostyla aegrota Mollendorff, Kobelt, and Winter, Semper's Reisen 



im Archipel der Philippinen, vol. 10, pp. 107-108 (in part), pi. 21, fig. 4. 

 1932. Cochlostyla (Corasia) aegrota Bartsch, Journ. Washington Acad. Sci., vol. 



22, p. 335. 



Shell thin, semitranslucent, depressed helicoid, with broadly conic 

 spire, feebly angulated peripherj^, and a short, well-rounded, imper- 

 forate base. The shell is covered with a very thin periostracum, 

 which is of a faint greenish yellowish tint, the shell substance itself 

 being white with a bluish tint. Nuclear whorls 1.5, well rounded, 

 smooth, forming an almost planorboid spire. The postnuclear whorls 

 are strongly rounded and appressed at the summit, the appressed 

 portion appearing as a slender white thread on the later whorls. They 

 are marked by retractively curved, almost threadlike incremental lines, 

 which are of irregular strength and spacing. These incremental lines 

 are also present on the base. The early postnuclear whorls show 

 indication of spiral sculpture, which becomes much enfeebled on the 

 later turns. The aperture is broadly oval; interior bluish white; the 

 peristome is narrowly expanded and reflected; the inner lip is rather 

 broad, slightly excavated, and slightly sinuous. The parietal wall is 

 covered by a moderately thick translucent callus. 



The specimen described and figured, U.S.N.M. no. 314079, was 

 collected by Quadras on Mindoro and is without specific locality. It 

 has 4.6 whorls and measures: Length, 29.3 mm; greater diameter, 

 40 mm. 



Subgenus Calocochlea Hartmann 



In this subgenus the shell is helicoid or subglobose, imperforate. 

 The periostracum is conspicuously marked with varied hydrophanous 

 patterns. 



Type: Cochlostyla (Calocochlea) pulcherrima (Sowerby). 



There are a number of species of this subgenus from Mindoro 

 Province. They are: 



Cochlostyla (Calocochlea) melanocheila (Pfeiffer). 



C. (C.) perpallida Bartsch. 



C. (C.) aopta (Clench and Archer). 



C. (C.) roissyana (Ferussac). 



C. (C.) gerlrudis Mollendorff, Kobelt, and Winter. 



COCHLOSTYLA (CALOCOCHLEA) MELANOCHEILA (Pfeiffer) 



Plate 94, Figures 4-7 



1840. Helix melanocheylosl var. lineolata Gratelotjp, Act. Soc. Linn. Bordeaux, 

 vol. 11, p. 163; not Helix lineolata Lamarck, 1822, Animaux sans vertebres, 

 vol. 6, p. 67. 



