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 li 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 



