﻿PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM 



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SMITHSONIAN INSTITUTION 



U. S. NATIONAL MUSEUM 

 Vol. 100 Washington : 1950 No. 3269 



SOME NEW GASTROPODS OF THE FAIVIILY CLAUSI- 

 LIIDAE FROM THE PHILIPPINE ISLANDS AND SIAM 



By F. E. LoosjEs 



While studying the Claiisiliidae (Gastropoda, Pulmonata) of south- 

 eastern Asia, 1 have had the opportunity of revising the species of this 

 area present in the United States National Museum, through the kind- 

 ness of Dr. H. A. Rehder. Among these shells I found three forms 

 thus far unknown to science: two from Calayan Island, one of the 

 northern islands of the Philippines belonging to the Babuyanes group, 

 about 75 km. north of Luzon and 300 km. south of Formosa ; and one 

 from northern Siam. Descriptions of these three new forms, two 

 species and a subspecies, are given below. 



Genus ZAPTYX Pilsbry 



ZAPTYX (ZAPTYX) ANNAE, new species 



Figure .'^l 



Shell small, sinistral, club-shaped, the spire broad, the lateral out- 

 lines becoming somewhat concave toward the proportionally wide, 

 obtuse apex; thin, semitransparent, brown, nearly dull, in a series of 

 specimens in various shades merging into yellowish gray.^ Whorls 

 7 to 81/2, slightly convex, sculptured with fine, rather straight, parallel 

 ribs, irregularly distributed, sometimes ending on the middle of the 

 whorl (36 to 107 ribs on the penultimate whorl) ; protoconch consist- 



1 One gets the Impression that there are a number of brown-colored specimens, a number 

 of yellowish gray-colored "albinotic"' specimens, and some specimens of Intermediate color, 

 but it is not easy to ascertain the limits of each group ; there are individuals that may be 

 placed as well In the one group as in the other. 



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