The Pond Snails. River Snails 



and a single row winding to the truncated apex. This shell is 

 the handsomest in the family. It is found on masses of crumbling 

 limestone fallen from the river banks. The greenish epidermis 

 contrasts pleasingly with the rich purple or salmon colour of the 

 smooth lining. Height, i to 2 inches. 

 Habitat. — Alabama River at Claiborne. 



Genus MELANTHO, Bowditch 



Shell ovate; spire elevated; whorls rounded, smooth; 

 peristome continuous, simple; epidermis olive; foot large, thin, 

 protruding much beyond the small snout; flesh pale, red-dotted; 

 teeth small. 



The Heavy Melantho (M. ponderosa. Say), typifies the 

 genus. The inner lip is applied as a thickening fold to the colu- 

 mella. Dark streaks are painted on the greenish exterior. The 

 lining is white; so is the surface under the horny epidermis. 

 The animal has a curious habit of flattening the foot and curling 

 it outward into a thin scroll, square in front. The neck lappets 

 are not grooved as water ducts. Length, ij to 2 inches. 



Habitat. — Lake Superior to Alabama. 



Genus LIOPLAX, Troschel 



Shell thin, ovate; spire elongated; foot large, square in 

 front, rounded behind, projecting beyond small head. A few 

 species in the United States. Variable. 



L. subcarinata, Say, has three rounded whorls, smooth or 

 showing a few faint elevated revolving lines. The apex is often 

 worn; the aperture oval. The foot is purplish in front, the 

 head pale orange, the eyes black. Length, J inch. 



Habitat. — Delaware River. 



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