U X I o . 



37 



TO 



w 



g 



& 



H 

 Eh 



f TRIANGULAR. 



*compressissimus. Lea. 



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

 Chenu. Han. 

 Unio depressa? 1 Haf.; but not of 



Lam. 

 Unio lineolatus. Say. 



^abacus. Hold. 



*camelus. 2 Lea. Han. 



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

 & Eat. Ulld. Con. East. Han. 

 Unio ventricosus. Desk. 

 Unio subovatus. Desk. 

 Unio occidens. Desk. 

 Mya ovata. Eat. 

 yEylia ovata. Swain. 



-dorsatus. Lea. 

 *excavatus. Lea. Chenu. 

 *perradiatus. Lea. 



^Canadensis. Lea. 



involutus. Bens. Blan. 

 *satur. Lea. Chenu. 

 *subovatus. 3 Lea. Chenu. Han. 

 *crassidens. 4 Lam. Chenu. Han. 



z 



TRIANGULAR. 



Unio cunealus. Bar. Sh. & Eat. 



mid. 



Unio nigerf Raf. 



I r nio ni 'i> r. Con. KiXst. 



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. 



*rnbiginosus. Lea. Desh. Chenu. Han. 

 Unio flavus. Con, Kiist. 

 Unio cerinus. Con. Kiist, 

 Cunicala rubiginosa. Swain. 



jaspideus (Mono.) Hupe? 



*striatulus. Lea. 



*pudicus. Lea. 



*anreus. Lea. 



*amabilis. Lea. 



1 Mr. Conrad makes depressa, Raf., ellipmria, Raf., 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!! 



2 I am much disposed to think this a variety of phaseolus, Hild. Dr. Kirtland considers it such in 

 his Ohio Reports. 



3 Mr. Say makes " ventricosus, Bar., occidens (nobis), subovatus (nobis), (var.), and capa.r, Green 

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

 species. 



' Crassidens, A"ar. a, Lam., is trapezoides (nobis). 



6 M. Hupe* says it is Alasmodonta, but I suspect it to be Monocondylcea. 

 10 



