AMNICOLA CINCINNATIENSIS, Ant. 



PLATE 1. FIG. 4. 



A testst albida, laevi, umbilicata; aperturJt ovata, labio 

 postice in anfractum ultimum attingente. Long. 6 mm. 



SYNONYMS AND REFERENCES. 



PALUDINA CINCINNATIENSIS, ANTHONY. Boston Journal 

 of Natural History, vol. iii. p. 279, pi. 3, fig. 3. 



DESCRIPTION. 



SHELL "somewhat ventricose, subumbilicate, 

 color delicate green: whorls four, smooth; spire 

 entire at the apex and prominent; suture deeply 

 impressed; aperture much dilated, approaching 

 to orbicular, nearly half the length of the shell; 

 length one-fifth of an inch." 



GEOGRAPHICAL DISTRIBUTION. Inhabits "the 

 canal near Cincinnati clinging to small stones." 



This is the most robust species hitherto 

 noticed amongst us; and is, in form, a miniature 

 representation of Paludina ponderosa, except 

 that it is decidedly umbilicated. The opercle 

 is of a pale bright yellowish-brown color. 



