66 



Collins, and D. H. Barnes, of New York, and was found in Lake 

 Superior by Mr. Schoolcraft. I recollect to have seen a specimen 

 two or three years since brought from Lake Erie, by James Grif- 

 fiths. It is proportionally longer than elongatus. 



Lymneus appressus. — Shell elongated ventricose ; volutions 

 six ; spire regularly attenuated to an acute tip, rather shorter than 

 the aperture ; body whirl dilated, proportionally large ; aperture 

 ample ; columella with the sinus of the fold profound, callus per- 

 fectly appressed upon the shell, to the base. 



Inhabits Lake Superior. 



This shell exhibits very much the appearance of L. stagnalis, 

 but its body whirl is less proportionally dilated. The callus of the 

 labrum is perfectly appressed to the surface of the whirl even to 

 the base, exactly as in stagnalis. I have seen but a single wea- 

 thered and broken specimen, which was sent me for examination 

 ])y my friends Messrs. Collins and Barnes, of New York. It was 

 found in Lake Superior, by Mr. Schoolcraft. 



Since writing the above, Mr. Jessup presented me with sev- 

 eral specimens, which he collected in Canandaigua and Cayuga 

 lakes. 



Lymneus elodes. — Shell oblong conic, gradually acuminated, 

 reticulate with transverse lines and longitudinal wrinkles ; whirls 

 rather more than six ; spire acutely terminated ; suture moderately 

 impressed ; aperture shorter than the spire ; labrimi, inner sub- 

 margin reddish obscure ; labium, calcareous deposit rather copious, 

 not appressed at base, but leaving a linear umbilical aperture ; body 

 whirl on the back longer than the spire. 



Inhabits Canandaigua Lake. 



Var. a. Whirls simply wrinkled across, the calcareous deposit 

 at base appressed to the surface of the whirl. 



This species was found by Mr. A. Jessup ; it bears the most 

 striking resemblance to L. pahstris. The variety was found by 

 the same enterprising mineralogist at Morristown, New Jersey. I 

 have subsequently received specimens from Mr. S. B. Collins, of 

 New York, who procured them in a marsh near the Saratoga 

 Springs. 



Lymneus destdiosus. — Shell oblong subconic ; whirls five, 

 very convex, the fourth and fifth very small, the second rather 

 large ; suture deeply indented ; aperture equal to or rather longer 



