SYNONYM. 



PALUDiNA iNTERTEXTA. Noh. DessemiYiator of Useful 

 Knowledge^ vol. 2, p. 244. 



DESCRIPTION. 



Shell subglobose, yellowish green or brownish, olivace- 

 ous with one to three obsolete bands, wrinkled, and with 

 minute, numerous, obsolete, revolving lines on the epider- 

 mis : spire depressed-conic, obtuse : volutions four, con- 

 vex : suture deeply indented : aperture much dilated, short 

 oval. 



OBSERVATIONS. 



This shell I found abundantly in the lakes and marshes 

 near New Orleans, and even in the Carondelet canal which 

 connects Lake Ponchartrain with the city. It is remark- 

 able for its globular form and for the numerous, obsolete, 

 transverse lines, which seem like equidistant corrugations 

 of the epidermis, having no effect whatever in modifying 

 the calcareous surface, upon which no trace of them is ex- 

 hibited. In good specimens two or three, obsolete, pale 

 bands are visible by transmitted light. 



REFERENCE TO THE PLATE. 



Figure 3. The adult shell. 



4. An old specimen. 



A. The operculum- 

 PLATE XXX. 



