Helices. 
LETTER VIII. 
—_—— 
UNIVALVES. 
To * * * & 
Patey justly observes, my friend, that a snail-shell 
is a wonderful, a mechanical, and, if we may so 
express ourselves concerning the works of nature, 
an original contrivance. ‘‘ Other animals have their 
proper retreats, their hybernacula also, or winter 
quarters, but the snail carries these about with him. 
He travels with his tent; and this tent, though, as 
