Synopsis Kresh-Water Moli^usca 



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. 



Fig 78A 



a.— Anus, 

 br.— Gill. 



b-c. — Uterus, 

 m. — Mantle. 



Type : C. crass ula Raf . 



Example: C. decisum (Say), fig. 75. Animal, fig. yO. Operculum, fig. yy. 



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



Animal: C. snhsolidiiin (Anth.), fig. 78A. 



