224 BERMUDA. 



following orders — the characters of which he has 

 drawn from the position and the form of the branchiae. 



1. The Pulmonea, — These animals breathe the 

 sitmosphere, receiving the air within a cavity, whose 

 narrow orifice they can open and close at will : they 

 are hermaphroditical, with reciprocal copulation; 

 some have no shell, others carry one, which is often 

 truly turbinate, but never furnished with an oper- 

 culum. Many of the species inhabit fresh waters; 

 but the greater number are denizens of the land — 

 requiring, however, a damp atmosphere to preserve 

 them in health and vigour. The aquatic species 

 form, notwithstanding the element in which they live, 

 no exception to the leading character of the order ; 

 they also breathe air, which they obtain by coming 

 periodically to the surface. 



Those of them which have no apparent shell, form 

 1. The genus Limax of Linnseus, or slugs, as they 

 are more commonly known. The species known 

 here is the Limax cinereus ; they are very voracious, 

 and destroy kitchen vegetables and ripe fruits in 

 field or garden, wherever they are found. 



2. The Testacella. — These animals resemble the 

 slugs in all respects, with the exception of the shell, 

 which is earshaped, and placed at the posterior 

 extremity of the body. One species is found here. 



