LIMN^A. 



41 



haps, the reflection of its labiuiu, which is not laid on the 

 body of the whirl. Where it joins above with the labrum, 

 the angle is quite acute, and is separated from the body 

 whirl. The specimen figured was not taken alive, and the 

 epidermis being destroyed, the description and representa- 

 tion are partially defective. The aperture is about two- 

 fifths the length of the shell. (Lea.) 



I was at first inclined to place Limnsea haydeni 

 in the synonymy of this species. It appears to be 

 distinct after more careful study of the specimens in 

 the collection. 



Fig. 51 gives, at one view, the various forms which 



I have considered 



Fig. 50. 



Fig. 51. 



Limnaaexilis 



Fig. 52. 



L. refiixa. L. exilis. L. unbrosa. 



given (Fig. 52). 



synonyms of L. 

 refiexa. 



Limnseus pa- 

 lustris, var. dis- 

 tortus, of Ross- 

 massler, is a form 

 of this species, as 

 shown by his fig- 

 ure, of which a 

 fac-simile is here 



