47 



Teetli small. Posterior tip rounded. This shell may 

 be easily known by its trunk-like appearance. It 

 attains a length of full three inches, and thickens with 

 age. Very abundant in the Fox, Illinois, and Ver- 

 million rivers. 



SUBGENUS ANODONTA, Brug. 



ETVMOI^OWV, ( i.^01M>->T0S,) Kdontnlouis. 



Anotionta oaeiituin. Lea. Shell llrm, beaks mod- 

 erate, with several undulations on them, and eroded. 

 Color black, and appearance, outside, polished. 

 Length, three inches ; height, one and one half. 

 Within, salmon color. Tliis tine species may be 

 found in the Vermillion river, near the Farm Ridge 

 Bridge. With the assistance of a racoon I was en- 

 abled to discover the localities of the largest speci- 

 mens. 



Anodonia ovatu. Lea. A rather broad, compressed 

 shell, found in the Illinois river. 



Anotionta imbcciiiioi, s.vy. This shell is small and 

 thin, of a bright green color exteriorly. Illinois river. 



Andonta corpiilenta. Cooper. A lai'ge, smootll spe- 



€ies. Loc. Illinois river. This shell has been mista- 

 ken, on account of its size, for A. Oraiidis, Say. 



The foregoing embraces all the species of the Family 

 Unionidae that have come under my own observation 

 as living within the limits of the county. There are 



