PLANORBIS CAMPANULATUS, Say. 



PLATE 1. FIGS. 7 11. 



P. testa ochracea, sinistrorsum subplana, dextrorsum 

 profunde umbilicata: anfractibus 4, transversim striatis: 

 apertura campanulata, intus angustata. 



SYNONYMS AND REFERENCES. 



P. CAMPANULATUS, SAY. Jour. Acad. Nat. Sci., vol. 2, 



p. 166. 

 P. CAMPANULATUS) GOULD. Invert, of Mass., p. 204, fig. 



133. 



DESCRIPTION. 



SHELL compact, composed of four slowly en- 

 larging, flattened whirls, striated by the lines of 

 growth: right or upper side deeply umbilicated, 

 the last turn plane, or slightly concave: the left, 

 or spire side, is plane, or but slightly depressed: 

 sutures distinctly marked: aperture deflected to 

 the left, much dilated, the throat narrowed by a 

 thick deposit on its anterior surface; peritreme 

 very oblique; labium meeting two-thirds of the 

 diameter of the penultimate whirl. 



COLOR yellowish or fuscous, inside bluish, 

 yellowish, or chesnut. 



K 2 



