66 
OoliinS; and D. H. Barnes^ of New York^ and was found in Lake 
Snpnrior by Mr. Scboolcraft. I recollect to Lave seen a specimen 
two o-r three years since brought from Lake Erie^ by James Grif- 
fiths. It is proportionally longer than elongatus. 
Lymneus appressus. — Shell elongated Yentricose ; 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 shelly 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 
labmm 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 
by my friends Messrs. Collins and Barnes, of New York. It was 
found ill 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 ; labrum, 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. J essup ; it bears the most 
striking resemblance to' X. The variety was found by 
the game 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 desidiosus. — ^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 
