LIMNEA FRAGILIS. 53 



me specimens of a species of Limnea, for which 

 he proposed the name decollata, 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 



