NERITACEA. NERITINA. *]3 



CHAPTER X. 



" The family of the Neritacea;' said Mr. El- 

 liot, as he renewed his lessons to Charles and 

 Lucy, *' are remarkable in their form. Their 

 left-margin is truncated, \Aithout any appearance 

 of a columella. They possess an operculum, 

 and are either marine or fluviatic. The genera 

 are, 



Navicella. 



Neritina Neriia, Nerite, or hoof-shell , 



Neri ta , Nerlta. 



Natica Neriia. 



" You will recollect that the order Tracltell- 

 poda is still continued. 



" Navicella is a foreign genus from the In- 

 dian rivers. 



" Neritina is a pretty genus of shells, from the 

 European, the East and West Indian rivers. 

 They resemble the Nerfta genus, but are all 

 fresh-water shells ; thin, smooth, and variously 

 marked; without any tooth or notch on the right- 

 margin of the aperture. 



5 



