20 VIVIPARA. 



red, while in the latter they are green. Halde- 

 man has correctly figured the species, but 

 some of Mr. Binney's figures have either been 

 drawn by oversight from the European V. 

 vivijpara, or else the artist has neglected to 

 represent the fourth (lowest) band. 



Prof. Haldeman's supposition that all the 

 ViviparaD m^e viviparous is no doubt correct, — 

 at least a large number of species are known 

 to be so. 



5. VIVIPARA WALTONII, Tryon. 



Hald., t. vii, f. 3, 4, suh-nom. P. Bengalensis. 

 Plate 13, fig. 2. 



Ovate-conic, moderately thick, spire mode- 

 rately elevated, whorls 5 — 6, somewhat flat- 

 tened above, more convex beneath ; aperture 

 small, oval, the lip scarcely covering the small 

 perforation. Epidermis polished, light olive, 

 with four dark revolving bands, within bluish, 

 exhibiting the bands. 



Length 22, diam. 17 mill. 

 [46] 



