398 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



COCHLOSTYLA (CALOCOCHLEA) GERTRUDIS Mollendorff, Kobelt, and Winter 



Plate 97, Figures 1-3 



1853. Helix solida Pfeiffer, Proc. Zool. Soc. London, 1851, p. 263; not Bulimus 



solidus Pfeiffer, Proc. Zool. Soc. London, 1842, p. 152. 

 1901. Cochlostyla roissyana solida Hidalgo, Obras malacologicas, pt. 1, pp. 



463-466; in part. 

 1901. Cochlostyla roissyana var. q Hidalgo, ibid., p. 466. 

 1910. Cochlostyla gertrudis Mollendorff, Kobelt, and Winter, Semper's 



Reisen im Archipel der Philippinen, vol. 10, pp. 205-206 (in part), pi. 42, 



fig. 5. 

 1932. Cochlostyla (Calocochlea) gertrudis Bartsch, Journ. Washington Acad. Sen 



vol. 22, p. 336. 



Shell helicoid. The early whorls are buff with a pinkish tinge; the 

 later turns, becoming increasingly darker, finally brown. The ground 

 color, however, when the periostracum is removed, is yellowish 

 olivaceous-buff. The interior of the aperture and columella are 

 white, while the outer lip is tinged with pale brown. Nuclear whorls 

 1.7, depressed, moderately rounded, and marked by incremental lines, 

 the last half of the last whorl being rather rough. The postnuclear 

 whorls are moderately well roimded, the first one fairly smooth and 

 marked by incremental lines and fine spiral striations. The succeed- 

 ing turn is marked by obsolete riblike axially slanting threads, which 

 become weaker on the last turn and more closely approximated. 

 These whorls also show microscopic spiral striations. The periphery 

 is feebly angulated ; base moderately rounded and marked by thread- 

 like axial riblets and spiral lines. The aperture is broadly oval, 

 oblique; the outer lip is very slightly expanded and reflected; columella 

 broad, somewhat excavated, and oblique. 



The specimen described and figured (U.S.N.M. no. 201040) was 

 collected by Quadras at Santa Maliyboy, Bongabon, Mindoro. It has 

 5 whorls and measures: Length, 28.8 mm; greater diameter, 36.7 

 mm; lesser diameter, 30.1 mm. 



Another specimen (U.S.N.M. no. 255973), from Mansalay Bay, 

 Mindoro, collected by myself, has 4.8 whorls and measures: Length, 

 25.8 mm; greater diameter, 34.2 mm; lesser diameter, 28.1 mm. 



Pfeiffer, in 1843, 11 described Bulimus solidus from San Juan, 

 Cagayan, Province of Luzon, which is a Cochlostyla. Later, in 1853, 12 

 he described Helix solida, which is likewise a Cochlostyla. This 

 second name, therefore, has to be suppressed, and this was done in 

 1910 by Mollendorff, Kobelt, and Winter 13 who rechristened the shell 

 Cochlostyla gertrudis, the name here applied. 



In a general way this shell recalls Cochlostyla roissyana, but it is 

 more depressed and more helicoid and lacks the dark columellar area 

 so characteristic of that species. 



» Proc. Zool. Soc. London for 1842, p. 152, 1843. 

 i* Proc. Zool. Soc. London for 1851, p. 263, 1853. 

 11 Semper's Reisen im Archipel der Philippinen, vol. 10, pp. 205-206, 1910. 



