LIMN^A. 107 



*** Sliell small or moderate^ glohosely ovate. 

 26. LIMN^A CATASCOPIUM, Sa2j. 



Hald. Monog. 6,1.1. 



This species is most numerous in the waters 

 of the Middle Atlantic States, and scarcely 

 extends southwards. To the north it reaches, 

 however, to the British possessions, and west- 

 ward to Michigan, while the specimens re- 

 ported from far western localities probably 

 belong to other species ; those represented by 

 Binney's figure 86 are L. solida, Lea. On the 

 west coast this species is replaced by its ally 

 L. Adelince, Tryon. 



The short variety {L. piiiguis of Say) is nu- 

 merous in the vicinity of Philadelphia ; there 

 is also a variety both at Mohawk, New York, 

 and at Philadelphia, which by its long spire 

 reminds one of L. elodes, Say (= palustris, 



Miiller). 



(81) 



