UNIO. 



39 



OBOVATE. 



*niodioliformis. Lea. 

 Unio delumbis. Con. 



*Floridensis. Lea. 



*tenerus. Rav. 



Unio tenebrosus. Con. 



pellucidus. Lea. 

 *amygdalum. Lea. 

 *lenior. Lea. Chenu. 

 *hyalinus. Lea. 



*nigrinus. Lea. 



Unio 

 Unio 



*Tappanianus. ! Lea. 

 Unio viridis. Con. 



Unio 

 Unio 

 Unio 



*foliaceus. 2 Gould. 



Unio 



Unio 



*contradens. Lea. CJienu. 



Unio 





Unio 



*obtusus. Lea. Chenu. 



Unio 





Unio 



ARCUATE. 



Unio 



*crassus. 3 Retz. 



Unio 



Unio crassissimus. Per. Des Moul. 



Unio 



Grrat. Merm. 



Unio 



Unio auricularis. 4 Speng. 



Unio 



Unio margaritacea. Drap. 

 Unio sinuata. Lam. Children. 5 



Unio 



Unio 



Blain. Dup. Desh. Menke. 



Unio 



Rossm. Graells. Puton. Reynies. 



Unio 



Unio rugosa. 5 Poir. 



Unio 



OT 



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H 





H 



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z ■ 





X 





K 





Ph 





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X 





m 





y, 





o 





a 



. 1 



ARCUATE. 



*monodontus. Say. Eat. DesJi. 

 Unio soleniformis. Lea. Chenu. 



*Lazarus. Lea. 



*emai - ginatus. Lea. 



Being unacquainted with the following species, 

 I have deemed it best simply to insert a list of 

 them, with the hope of their being determined at 

 a future period : — 



Aberti. Con. 

 seruginosus. Morelet. 

 Aleroni. Mast. 

 Ardusianus. Reynies. Dup. 

 asterianus. Dup. 

 Aztecorum. Phili. 

 Bigorrensis. Millet. 

 Boscianus. Dunker. 

 calimatorum. Morelet. 

 Carniolicus. Zeigler. Potier. 

 Casablancae. Phili. 

 coriaceus. Dunker. 

 crocolilorum. Morelet. 

 Damnoica. D' Orb. 

 delphinulus. Morelet. 

 digitatus. Morelet. 

 divergens. 6 Benson. 

 Drouatii. Dup. 

 Durieui. Desh. 

 evanescens. Mouss. 

 errosus. Jay's Cat. 



1 A fine suite of this species has been kindly sent to me recently by Prof. Haldeman, of Columbia, Penn., 

 taken from the Susquehanna River at that place. In most of them, I find the cardinal teeth of the left valve to be 

 trifid, and the lateral teeth of the same valve somewhat divided. In the right valve, the cardinal tooth is nearly 

 as long as the lateral tooth; in this taking somewhat of the character of Triquetral,, Klein,, {Hyria of Lamarck.) 



3 I am disposed to think that this may prove to be the same with Javanus (nobis). 



s See note to Margariiana margantifera. 



* Fide Ferussac. 



5 I think Mr. Children meant this species, but his figure (69) is evidently Unio alatus, Say, although he cites 

 it as European. 



6 See note on U. Leaii. 



