44 ( ' A TA 1 ,0< JU !<:- -FA M I LY UNION ID.K. 



*Unio piiculiiv. Le, Sueur. 



(Fijrmvd ?i 



Tliis is a widely distributed form belonging to the group of which IT. undnltt 

 fu,s, Barnes, is the type. It ranges from the Ohio to the Cumberland, to Kansas. 

 to the Red river of the North, at Pembina. r. piiuciplictitu*. Lea. from Texas, 

 groups her^, and is a closely related form. 



\ (Jnio popenoi, Call. 



(Bull, of the Wasliburn Coll. Laboratory of Nat. Hist. Xo. II, Pi. IT, Fifs. 14.) 



Fall and Verdigris rivers, soutlieast Kansas. A member of the irrorutux 

 group. 



t Unio powellii, Lea. 



(Trans. Am. Phil. S<x-. :,'nd Scries. Vol. X. I' . XIX, Fiji'. :';">.> 



Thi,- sjiecies, a member of the hitcoltt* group, has been reported only froiu 

 the original locality the Saline river, Arkansas. 



*Unio pressus, Lea. 



(Trans. Am. Phil. Sor.. r.Vl Spri;>s. Vol. 111. PI. XII. Fi\ 'Jx'. as S////i/>/J//'fa 

 co)nprea. Lea.) 



Rideau river, Canada, to central New York, to Nemaha river. Nebraska, to 

 Wisconsin and Michigan. 



f Unio propuiqiuis, Lea 



(Jour. Acad. Nat. Sri. Phi.'a,, L'nd S.-rit-s. Yi.J. V, PL V, Fiu-. ;-'1:3.) 



Clinch. Holston and Tennessee rivers, to Tuscnnibia, Alaltama. This is a 

 member of the perple.rn* srroup. from some forms of \vhichit may not prove- 

 specifically distinct. 



il iiio piulicns. Lea. 



(Jour. Acad. Xat. Sei. 1'hiln., 2d St-ries, Vi!. IV PI, LVI. Ki-. 171. i 



Elk River, Tennessee and north Alabama. Very dose to /m//>]/n.v/x. whicti 

 si^e. 



I I'nio pulolier, Lea. 



(Trans. Am. Phil. Soc.. Vol. VI, PI. III. Fi< i; > 



Nashville. Tennessee, in the Cunibcrlftiid river. (Jroups with ligament inns, 

 Lamarck. 



CATALOGUE 3<), 



