THE FA3IILY NAIADES. 



23 



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SUBROTUND. 



lubellus. 



Con. 



Masoni. Con. 



*ioluiidatus. ham. 



Unio suboibiculata. ham. Blain. 

 Unio glebulus.f Say. 

 Unio subglobosus. hea. 



*Paranensis. hea. D^Orh. 

 Unio Solisiana. D^Orb. 



membranacea.| hea. 



Myt. membianacea. J\Iat. 

 Myt. Matoniana. D'Orb. 



variabilis, hea. 



Mya variabilis.§ Jlfai. Wood. Dill. 

 Unio votundus. fFag-. 



*persoiiatus. Say. 



Unio capillaris. Lea. 



*retusus. ham. Con. 

 Unio torsa. Raf. Eat. 



*ebenus. hea. 



Unio mytiloides. Con. ; not iZa/. 



maculatus. Con. 



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2 



SUBROTUND. 



*Kirklandianus. Lea. 



*subrotundus. hea. 

 Unio politus? (S'a?/. 

 Unio brevialis? Crouch. 



infiicatus. Con. 



*coccineus. hea. 



Unio coccineus. Dr Hildretli's hetter. 

 Unio coccineus. Con. 

 Unio catillus. Con. 



WIDE. 



*Shepardianus. hea. 



*folliculatus. hea. 



* rectus, ham. Eat. 



Unio praelongus. Bam. Hild. 

 Unio recta. Valen. 

 Unio Sageri?|| Con. 

 Mya prcelonga. Wood. 



*dehiscens.^ Say. 

 Unio Qriens. Lea. 



*angustatHs. hea. 



t Although Mr Say had published this shell in the Transylvania Journal, and in his Am. Conchology, he 

 omitted it altogether in his " Synonymy." Other species are inserted from the vicinity of New Orleans. 



X I formerly placed this with the Anodontse, but D'Orbigny, who has seen the shell in its native waters, 

 having placed it among the Uniones, I follow him, never myself having seen the shell. The figure of Dr 

 Maton (Linn. Trans. Vol. X) is without teeth, and the text says expressly "cardo edentulus." Notwithstand- 

 ing this, I am inclined to believe that D'Orbigny is right, for the form of the shell is such as I have not seen in 

 the Anodonlse. Not knowing what induced M. D'Orbigny to change Dr Maton's name, I have restored it. 



§ The figure of this shell in the Lin. Soc. Trans., Vol. X., although so much smaller a shell than Para- 

 nensis (nobis), is so much like it, that I should not be surprised if they should prove to be the same. 



II Mr Conrad's figure so nearly resembles the male specimens of U. rectus, from Green Bay, in my cabinet, 

 that I am persuaded the Sageri will not prove to be a distinct species. Drs Kirtland and Ward, and Judge 

 Tappan, consider it a variety of gibbosus of Barnes. 



U Mr Say gives Mr Rafinesque's name of lata precedence. Mr Eaton says that An. lata, Raf., is Sym. 

 tenuissima, Lea. 



