22 LIMNEA FRAGILIS. 



North-west Territory; Canada, as far north as 

 Great Bear Lake, and Maine: in Massachu- 

 setts, figs. 2, 6, 8, Dr. Gould: New York and 

 Lake Erie, fig. 9: Ohio, figs. 1 and 7: Eastern 

 Pennsylvania, figs. 3, 4, 10, 11, from a spring 

 in Berks county, connected with the Schuylkill. 

 I have a specimen H inches long, and rather 

 more than half an inch in diameter, from Lewis' 

 river, Oregon, which I refer to this species, 

 although it is more ventricose than the indi- 

 viduals we are accustomed to see. 



OBSERVATIONS. 



I am indebted to Dr. Gould (who has given 

 an interesting account of this species), for the 

 description and drawings of the animal. Figure 

 5 will give those who are not acquainted with 

 the animals of this family, an idea of the form 

 of the head and tentacles. 



Say remarks that his elodes "bears the most 

 striking resemblance to L. palustris of Europe, 

 and I am almost inclined to think it a mere 

 variety of that species." I unite the two, be- 

 cause I am unable to point out any distinguish- 

 ing characters between them. Whether the 

 foreign shells are as variable among themselves 



