226 BERMUDA. 



7. BulimuS. — These animals are terrestrial, and 

 some of them are remarkable for the size and stony 

 hardness of their eggs. This genus is numerous 

 in species, and may be represented by Bulimus 

 lubricus. 



8. Achatina — We have a species, the Achatina 

 columaria, one of the most remarkable of land 

 shells ; it is reversed, and the columella forms a 

 winding pillar, visible within, quite to the summit of 

 the spire. A small species found in the South Sea 

 Islands is strung by the natives, and used for an 

 ornament. 



9. Succinea. — We have a species which we shall 

 call Succinea Bermudiensis. Shell, ovate-oblong, 

 very thin, pellucid, yellowish ; spire short ; aperture 

 dilated. 



The Aquatic Pulmonea have only two tentacula ; 

 they come ever and anon to the surface to breathe, 

 so that they can only inhabit waters of inconsiderable 

 depth; thus they hve in fresh waters or brackish 

 pools. 



1. Genus Limncsus (the fresh-water snails). — The 

 species observed here is the Limnsea auricularia. 



2. Genus Physee, — These animals are most fre- 

 quently found on the under side of the leaves of 

 aquatic plants ; they have a very singular way of 



