IT N I O . 



37 



TRIAXGULAB. 



■•■•"compressissimus. Lea. 



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

 Chenu. Han. 

 Unio depressa?^ Liaf.; but not of 



Lam. 

 Unio lineolatus. Say. 



^abacus. Hald. 



"camelus.^ Lea. Han. 



*ovatus. Say. Lam. Bar. Valen. Sh. 

 & Hat. Hild. Con. Kust. Han. 

 Unio ventricosus. Desk. 

 Unio subovatus. Desh. 

 Unio occidens. Desh. 

 Mya ovata. Hat. 

 jEylia ovata. Swain. 



*dorsatus. Lea. 

 "-excavatus. Lea. Chemi. 

 ■^perradiatus. Lea. 

 ^Canadensis. Lea. 



involutus. Bens. Blan. 

 *satur. Lea. Chenu. 

 *subovat"us.^ Lea. Chenu. Han. 

 *crassidens.* Lam. Chenu. Han. 



TRIANGULAR. 



Unio cu7ieatus. Bar. Sh. & Eat. 



Hild. 

 Unio niger? Raf. 

 Unio niger. Con. Kilst. 

 Mya cuneata. Eat. 



"*incrassatus. Lea. 



*corvus. Lea. 



*macrodon. Lea. 



*Forbesianus. Lea. 



*gibber. Lea. Chemi. Han. 



lunifer. Bourg. 

 *pumilus. Lea. Chenu. Han. 



Orbignjd. Dcville and Hupe. 



*rubiginosus. Lea. Desh. Chenu. Han. 

 Unio flavus. Con. Kilst. 

 Unio cerinus. Con. Kilst. 

 Cunicula ruhiginosa. Swain. 



jaspideus (Mono.) Hupe.^ 



*striatulus. Lea. 



*pudicus. Lea. 



^aureus. Lea. 



*amabilis. Lea. 



^ Mr. Conrad makes depressa^ Raf., ellipsaria, Eaf., and securis (nobis), synonymous with lineolata, 

 Raf. Mr. Say does the same, with the exception of ellipsaria, which he considers distinct; while Mr. 

 Rafinesque himself places lineolata and ellipsaria in different subgenera ! ! 



'' I am much disposed to think this a variety of p)haseolus, Hild. Dr. Kirtland considers it such in 

 his Ohio Reports. 



' Mr. Say makes '•'■ venti-icosus, Bar., occidens (nobis), subovatus (nobis), (var.), and capax, Green 

 (var.)," synonymous with cardium^ Raf. In my opinion, they form at least three, perhaps four, distinct 

 species. 



* Crassidens, Var. a, Lam., is trapezoides (nobis). • 



^ M. Hup^ says it is Alasmodonta, but I suspect it to be Monocondyloea, 

 10 



