UN 10. 



37 







;". 



& 





CD 



IB 



O 



TRIANGULAR. 



*compressissimus. Lea, 



*securis. Lea. Sh. & Eat. Desk. 



Chenu. Han. 

 Unio depressa? 1 Raf.; but not of 



Lam. 

 Unio lineolatus. Say. 



*abacus. Hold. 

 *camclus. 2 Lea. Han. 



*oVatus. Say. Lam. Bar. Valen. Sh. 

 & Eat. Hild. Con. Kust. Ilan. 

 Unio ventricosus. Desk. 

 Unio subovatus. Desk. 

 Unio occidens. Desk. 

 Mya ovata. Eat. 

 JEylia ovata. Swain. 



*dorsatus. , Lea. 

 *excavatus. Lea. Chenu. 

 *perradiatus. Lea. 

 *Canadensis. Lea. 



involutus. Bens. Blan. 

 *satur. Lea. Chenu. 

 *subovatus. s Lea. Chenu. Han. 

 *crassidens. 4 Lam. Chenu. Han. 



TRIANGULAR. 



Unio cuneatus. Bar. Sh. < Eat. 



mid. 



Unio niyerf Raf. 



Unio niger. Con. Kust. 



Mya cuneata. Eat. 



*incrassatus. Lea. 

 *corvus. Lea. 

 *macrodon. Lea. 

 *Forbesianus. Lea. 

 *gibber. Lea. Chenu. Han. 



lunifer. Bourg. 

 *pumilus. Lea. Chenu. Han. 



Orbignyi. Deville and Hupe. 



*rubiginosus. Lea. Desk. Chenu. Han. 

 Unio flavus. Con. K'iist. 

 Unio cerinus. Con. Kust. 

 Cunicula rubiginosa. Swain. 



jaspideus (Mono.) Ilupe? 

 *striatulus. Lea. 

 *pudicus. Lea. 

 *aureus. Lea. 

 *amabilia. Lea. 



1 Mr. Conrad makes drpressa, Raf., eUipsaria. IJat'.. :uicl .-v ( (//v's (nobis), sjiionymous with linrolata, 

 l!af. Mr. Say does the same, with the exception of el/i/i.-nir/n. whirh lie considers distinct; while Mr. 

 Rafinesque himself places lineolata and ellipsaria in dill'erent snbgeneral! 



2 1 am much disposed to think this a variety of pha$eoliti>, Hild. Dr. Kirtland considers it such in 

 his Ohio Reports. 



3 Mr. Say makes "ivH^-i'cosws, Bar., ocridens (nobis), siiboraht.* (nobis), (var.), and cnj>n.r. Green 

 (var.)," synonymous with cardium, Raf. In mj- opinion, thej- form at least three,* perhaps four, distiiu-t 

 species. 



4 Crfix*i(1rx, Var. a, Lam., is trapezoides (nobis). 



5 M. Hupd says it is Alanmodonta, but I suspect it to be Monovondijloea. 



10 



