113 



bladders before mentioned. It inhabits the 

 coasts of Europe, Asia, and Africa, and is com- 

 mon in the Mediterranean. A few specimens 

 have been picked up on the Welsh coasts, but 

 these were probably driven there by storms. 



HELIX Obscura. 



SMALL BROWN SNAIL. 



Specific Character. Shell sub-oval, rather 

 obtuse, opaque, with about six longitudinally 

 wrinkled whorls ; aperture roundish, lunar ; it is 

 of a brownish horn colour, and the outer lip 

 white, with a reflected margin ; length half an 

 inch, breadth one fourth, or one sixth. These 

 shells are usually covered with an epidermis, 

 which varies according to the situations they 

 occupy ; and the colour being regulated by that 

 of the substance to which they attach themselves, 

 they thus escape observation. 



Genus NERITA.* Plural, Nerita. 



NER1TE OR HOOF-SHELL. 



Generic Character. Shell univalve, spirally 

 convoluted, spire retuse; form gibbous, flattish 



* Plate V. figures 4, 5. 

 I 



