UNIO. 



33 



' QUADRATE. 



""speciostis. Lea. 



■^asperrimus.^ Lea. Han. 

 TJnio quadrulus.^ Say, Con. 

 TJnio nohilis. Con. 



^Eumpliianus. Lea. 



■"Blandianus. Lea. 



*fragosus.^ Con. Hem. 



*P]iillipsii. Con. Kilst. Han. 



■^Cincinnatiensis.* Lea. Chenv,. 



*pustulatus. Lea. Ghenu. Han. 

 Unio nodulatus. Con. 



*Sclioolcraftii.' Lea. LLan. 

 TJnio iprasinus. Con. 

 Unio nodiferus. Con. 



TRIANGULAR. 



^^ajjiculatus. Say. Con. Chenu. Han. 

 *asper. Lea. Chenu. Han. 

 *Dorfeuillianus. Lea. Cheiiu. Han. 

 *stapes. Lea. Con. Chenu. Han. 



*tuberosus. Le 



Che 



mid.. 



Bar. 



Swain. 



Chenu. 

 Hild. 



( TRIANGULAR. 



*sparsus. Lea. Chenu. 



*inetanevrus. Raf. Con. Kust. Sh. 

 & Eat. Han. 

 TJnio nodosus. Bar. 

 TJnio rugosus (Flat). 



Adams. 

 Telederma metanevra. 

 Mya nodosa. Eat. 

 Mya rugosa. Eat. 



*Wardii. Lea. 



*interniedius. Con. 



*cornutus. Bar. Han. 

 Mya cornuta. Eat. 

 TJnio reflexa? Haf. 

 TJnio reflexus. Con. 

 TJnio torulosus. Raf. fide Sh. & Eat. 



SUBROTUND. 



*pustulosus. Lea. Chenu. Han. 

 TJnio verrucosus. Bar. Var. b. 

 TJnio verrucosa. Yalen. 

 TJnio verrucosus alius. Say; but not 



of Hildreth.^ 

 Unio hullatus. Con. 



*sp3ericiis. Lea. 

 *asperatiis. Lea. 



1 Mr. Say supposed this to be the rugosus, Barnes. Two specimens referred to by Mr. B. as rugosus 

 were under my inspection, and proved to be— the one a flat meteneura, Rafln., the other a plicatus, 

 Lesueur. Mr. B., in his reclamation, recognizes his rugosus as U. Peruviana., Lam., which shell is 

 undoubtedly the plicatus, Lesueur and Say. 



^ This variety of asperrimus I have had in my cabinet for about twentj'-five j^ears, and always 

 regarded it as too similar in its characters to raise it to a distinct species. 



^ This shell has been considered the female of asperrimus (nobis), but I have no doubt of its being 

 distinct. Some of our best western naturalists think it to be the true rugosus of Barnes. 



* This may be found to be the male of Phillipsii Con., when the soft parts shall be examined. 



^ Prof. Kirtland thinks this may prove only a variety of jiMsiiitosMS (nobis), but I am not of that 

 opinion. 



^ A specimen sent to me by Dr. Hildreth as Unio verrucosus albus, proved to be a true irrorafus 

 (nobis). 



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