14 LIMNEA MEGASOMA. 



48°) and collected by Dr. Binney "in a swamp 

 in front of the town of Burlington, Vermont, 

 very near the shore of Lake Champlain." 



OBSERVATIONS. 



"This remarkably large and fine species was 

 found in Bois blanc Lake, North-west Territory, 

 by Dr. Bigsby, to whom I am indebted for 

 specimens. The color is brownish, sometimes 

 lineated across the body whorl with dull green- 

 ish and pale ochraceous; and the chesnut- 

 brown color of the interior of the shell, com- 

 bined with its large dimensions, distinguish this 

 species from all others yet discovered in this 

 country." — Say. 



The shell of this species is rare in collections, 

 and I am indebted to the liberality of Dr. A. 

 Binney of Boston, for the only specimens in 

 his cabinet. The shell reminds one of the 

 young of Plekocheilus undulatus, Guilding. 



The N. W. Territory must be the original 

 station of this species; whence it has reached 

 a distance of 1,500 miles, with the descending 

 waters. The more rapid current of the Mis- 

 sissippi, and the difference in climate, have 

 doubtless prevented it from establishing itself 

 in the Western States. 



