its whorls. When viewed in profile it exhibits a sh'ghtly 

 reflected appearance. It was kindly sent to me for exam- 

 ination by my friends Messrs. S. B. Collins and D. H. 

 Barnes of New York, and was found in Lake Superior 

 by Mr. Schoolcraft. Mr. James Griffiths obtained spe- 

 cimens in Lake Erie^ It is proportionally longer thaiv 

 L. umbrosus. 



REFERENCE TO THE PLATE, 



Fig. 2, Two views ; natural size. 

 PI. 31. 



LIMNEUS ELODES. 



DESCRIPTION. 



Shell oblong conic, gradually accuminated, somewhat 

 reticulate with irregular transverse lines and longitudinal 

 ^vrinkles : whorls rather more than six : spire acutely ter- 

 minated : suture moderately impressed : aperture shorter 

 than the spire : labrum, inner submargin obscure reddish : 

 labium, calcareous deposite rather copious, not appressed 

 at base, but leaving a linear umbilical aperture : body ivhorl 

 on the back longer than the spire. 



PI. 31. 



