Synopsis Fresh-Water Mollusca 



25 



Genus CAMPELOMA Rafinesque, 1819. 



Shell dextral, spiral, imperforate, thick and solid; olivaceous green, uni- 

 colored, spire produced ; whorls smooth, rounded or shouldered ; aperture 

 oval ; lip simple, columella and parietal wall usually callously thickened. 

 Operculum concentric, inner margin simple. 



Fig- 75 



Fig 78 



Animal with the foot large, rather thin, much produced beyond the 

 snout; snout small; teeth of the radula simple or only very minutely crenu- 

 lated. 



a. — Anus, 

 bf.— Gill. 



b-c. — Uterus, 

 m. — Mantle. 



Type : C. crassnla Raf . 



Example: C. decismn (Say), fig. 75. Animal, fig. 76. Operculum, fig. yy. 



Radula: C. integrum (Say), fig. 78. 



Animal: C. subsolidiim (x^nth.), fig. 78A. 



