178 POPULAR BRITISH CONCHOLOGY. 



SO globose as H. moniUfera ; in size it is between the 

 two, and it is of a uniform cliestnut or leaden hue. 

 The animal is of a dusky brownish tint. 



iV. Montagui has a small, reddish, globular shell, with a 

 whitish band near the suture. 



N. Helicoides : the shell is thin, white, oval, with scarcely 

 any umbilicus or callus on the inner lip. 



N. pusilla: shell smaller and more tapering than N. Mon- 

 tagui; umbilicus small. 



N. Kingii: shell very small, white, with yellow epidermis; 

 spire produced ; scarcely any umbilicus. 



VELUTINIDJE. 



I. Yelutina. — Here we seem to be returning to a more 

 simple form of animal. It has a thick foot, with perpendi- 

 cular sides ; a head produced into a proboscis ; a pair of long 

 tentacles, with eyes at their bases; no operculum. Shell 

 with a very small spire, and large, oblique, spread mouth. 

 V. Icevigata has the well-known pinkish shell, with a brown 



velvety epidermis, and a bright orange-coloured, slightly 



speckled animal. 

 V. flexilis has a light- greenish, membranaceous, shell-like 



protection. 



