UNIO. 





 X 



to 



X 

 X 



QUADRATE. 



*speciosus. 



*asperrimus. 1 



C/nio quadrulus.* Say. Con. 

 Unio nolilis. Con. 



*Kumphianus. Lea. 

 *Blandianus. Lea. 

 *fragosus. s Con. Han. 

 *Phillipsii. Con. Kilst. Han. 

 *Cincinnatiensis. 4 Lea. Chenu. 



*pustulatus. Lea. Chenu. Han. 

 Unio nodulatus. Con. 



*Schoolcraftii. 5 Lea. Han. 

 Unio prasinus. Con. 

 Unio nodiferus. Con. 



TRIANGULAR. 



*apiculatus. Say. Con. Chenu. Han. 



*asper. Lea. Chenu. Han. 

 *Dorfeuillianus. Lea. Chenu. Han. 

 *stapes. Lea. Con. Chenu. Han. 

 *tuberosus. Lea. Chenu. 



TRIANGULAR. 



*sparsus. Lea. Chenu. 



*metanevrus. Raf. Con. Kust. A'//. 



& Eat. Han. 



Unio nodosus. Bar. Hlld. Chfnu. 

 Unio ruyosus (Flat). Bar. Jlihl. 



Adams. 



Telederma metanevra. Swain. 

 Mya nodosa. Eat. 

 Mya rwjosa. Eat. 



*Wardii. Lea. 

 *intermedius. Con. 



*cornutus. Bar. Han. 

 M>/a cornuta. Eat. 

 Unio reftexaf Raf. 

 Unio reflexus. Con. 

 Unio torulosus. Raf. fide Sh. & Eat. 



SUBROTUND. 



*pustulosus. Lea. Chenu. Han. 

 Unio verrucosus. Bar. Var. b. 

 Unio verrucosa. Valen. 

 Unio verrucosus allm. Say; but not 



of Hildreth* 

 f 'it io bullatus. Con. 



*spaericus. Lea. 

 *aspcratus. Lea. 



1 Mr. Say supposed tliis to be the rugosity Barnes. Two specimens referred to l>y Mr. I!. as 



were under my inspection, and proved to be the one a flat m<-lut-i-r<i, Uatin., tin- otlu-r a />li>;i/n.--. 

 Lesueur. Mr. B., in his reclamation, recognizes his ruyosus as V. I'l-rni-iuna, Lam., which slu-11 i> 

 undoubtedly the plicatim, Lesueur and Say. 



2 Tliis variety of asperrimus I have had in my cabinet for about twenty-five years, and alwa3's 

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



3 This shell has been considered the female of (ix/H'rrfuiHx (nobis), but I have n<> doubt of its being 

 distinct. Some of our best western naturalists think it to lie the true riii/it.-nis of Barnes. 



* Tliis niay.be found to be the male of rhilliptii Con., when the soft parts -.hall ! i-Mimmed. 



6 Prof. Kirtland thinks this may prove only a variety of p>i*/>il<>*ii.< (nobis), v but I am not of that 

 'opinion. 



6 A specimen sent to me by Dr. Hildreth as l'ni<> i-<-rrucosus albus, proved to be a true irroratus 

 (noliis). 



9 



