POHDSNAtlS 



N spite of the title of this chapter 

 we are bound by the natural 

 affinities of tlie animals to in- 

 clude in it some species that 

 have nothing to do with ponds, 

 one that is an undoubted land-snail, several that 

 belong to the seashore, and one that is somewhat 

 amphibious. But all our pond-snails will be included 

 also, and as these make up the greater part of the 

 chapter its title will probably be forgiven as the most 

 appropriate in the circumstance. 



The Least Herald-shell {Carydimr)i oninhnum), 

 which is found among: moss and dead leaves in 

 woods, will serve to introduce us to the order 

 Pulmonata, though we shall find the characters of 

 the order more visibly manifested in following 

 species. The members of the order are distin- 

 guished by the possession of two pairs of tentacles, 

 and by their breathing air by means of a cavity 



