DES MOIXKS ACADEMY OF SCIENCE. 23 



*Unio camptodon, Say. 



descriptions of Ihc shells of North America. PI. X.LI1.) 



Ohio to Alabama: to Little Wachita river, Texas; north to Kansas. This 

 species is not far from I', inunutiinx, Gould, if indeed it be not indentical. It is 

 t he type of a group which includes I.T. tetralasmux, U. symmetricus, and /.". 

 </ct'/rrJ.s-, the first named being, probably, a synonym. Say's figure, to which 

 reference is given above, does not well represent this species as it is usually 

 found. 



'*Umo capax, Green. 



(Trans. Am. Phil. Soc., Vol. V, PI. IV, Fig 1 . 12, as Symphynota gloltosa, Lea.) 

 Ohio river, near Cincinnati, to eastern Iowa, in the Mississippi river, at Mus- 

 ratine. This form groups with 17. ventricosus, Barnes, which see. 



f Unio caix'ratus, Lea, 



(Trans. Am Phil. Soc., 2nd Series, Vol. X, PI. V, Fig. 14.) 



Powell's, Clinch and Holston rivers, Tennessee. It groups with U. drown i*. 

 Lea. 



I Unio rapillaris. Lea, 



iTrans. Am. Phil. Soc., Vol. V, PI. II, F\: i.t 

 ' ; Ohio.'' No further information is attainable* 



{ Unio capsjvforinis, Lea. 



(Trans. Am. Phil. Soc.. Vol. V, Pi. II. Fiir. 4. The specimen figured is a male.) 

 Aslunille, North Carolina; Holston, Clinch, Cumberland and Tennessee rivers, 

 Tennessee. This form groups with 1\ jwrplc.ru*, and is not far removed from 

 it. 



f Unio chjittanooii'aeiisis, Lea. 



(Jour. A cad. Nat. Sci. Phi]., 2nd Series. Vol. IV, PI. XXV. Fiir. '. .; 

 Tcuncsstii 1 river, at Chattanooga: Etowah ami Oostanaula rivers, at Kom\ 

 <;'orgia: Coosa. Cahawba. and Alabama rivers, Alabama. This is a member of 

 Hit- rifiruN gronj). Hie s\ nonomy of which is very great. See under I'nio 

 'l<irux. Lea. 



I Unio ciiii'iiiiiationsis. Lea. 



(Trans. Am. Phil. Soc. :.'nd SM-.. Vol. VllL PL Vlll. Fi.-. L) 



This, a member of thegrouji of /". pcriik.ni^ with which it is probably synony- 



CATAi.o<;rK l.'i. 



