20 BOOK OF SPECIES. 



VITRINA. TERRESTRIAL. 



Small, extremely thin, depressed; spire very short ; 



body very large ; aperture ampule, rounded, and 



oval ; left margin slightly inflected. 



V. PELLUCiDA. Extremely thin, pellucid and 

 glossy, depressed, with the spire very short, of a 

 pale yellowish green ; aperture large and oval. 

 B. very small. T. 21. 



V. ELONGATA. Whitish, nearly globular, 

 hyaline ; aperture oval-oblong ', volutions two, 

 outer one extremely large in proportion, minute. 

 B. T. 22. 



TRACHELTPODES. 



LES COLIMACES. 



HELIX. TERRESTRIAL. 



Orbicular, convex or conoid above, sometimes 

 globular, with the spire somewhat elevated; 

 aperture entire, transverse, very oblique, con- 

 tiguous to the axis of the shell; margin dis- 

 united by the projection of the body. 

 H. PULL A. Sub-globular, with the body- 

 whorl ventricose, and the spire short, obtuse, 

 and convex ; aperture large, with the outer lip 



