LIMNEA FRAGILIS. 53 



me specimens of a species of Limnea, for which 

 he proposed the name decollate and which he 

 has since published in conjunction with Pro- 

 fessor Adams, in the Boston Journal of Natural 

 History. Figures 1, 2, 3, represent this pro- 

 posed species; and 4 (distorted) 5, specimens 

 from Oregon, referred to on page 8, as belong- 

 ing to L. catascopium. The great resemblance 

 existing between 1 and 5, is sufficient to induce 

 me to consider them as being the same; and 

 they do not appear to have any character to 

 warrant a separation from L. catascopium, or 

 a union with L. emarginata, or any other allied 

 species. 



LIMNEA FRAGILIS, Lin. 



PLATE 15. FIG. 1. 

 OBSERVATIONS. 



My friend Dr. Gould objects to my having 

 referred L. elodes, Say, to the Helix fragilis, 

 Lin. In this, I merely followed Lamarck, and 

 others, whom we may presume to be good 



