Ponds. — Shells. 



35 



the foliage of an antediluvian Palm tree. The figure of a portion of 

 one is given at Fig. 9. Some of these plumose fragments can be 

 traced for more than a foot between the layers of shale. 



Fig. 9. 



Fig. 10. 



Natural size. 



Ponds. — Shells. — After leaving Trumbull, we enter Portage 

 County. In this county we found a number of beautiful ponds, 

 from each one of which flows a perennial stream. One, which lies 

 a few miles south of our route, in Stark County, called " Congress 

 Lake," was, until recently, the only known locality of the fine univalve 

 shell, Lymnaa stagnalis. It was discovered by Dr. K. in the 

 course of the last season. I have one in my possession, which is 

 two inches in length, with the body whorl three fourths of an inch in 

 diameter. As this rare and elegant shell has not been figured or de- 

 scribed by any American conchologist, a drawing is given at Fig. 10. 

 The description is copied from Dillwyn, and appears to be so simi- 

 lar to that of our own shell, that there can be no doubt of its identity 

 with the European species, although it is a rare fact, and which 

 scarcely again occurs in all our long list of land and fresh water 

 shells. GeoiTroy calls it " Le grand Buccin." 



Lymncea stagnalis. (Lamarck.) — Specific Character. — " Shell 

 imperfect, oblong, ventricose, pellucid, with the spire produced and 

 subulate ; aperture ovate." 



Description. — " Shell often two inches long, and about half as 

 broad, thin, brittle and pellucid, of a whitish, dusky, or grayish color; 



