nxio. 



33 



V. 



z 



- 



Eh 

 O 

 V- 



HI 



QUADRATE. 



*speciosus. Lea. 



Asperrimus. 1 Lea. Han. 

 Unio quadrulus. 2 Say. Con. 

 Unio nohilis. Con. 



*RumpManus. Lea. 



*Blandianus. Lea. 



*fragosus. 3 Con. Han. 



*Phillipsii. Con. Rust. Han. 



*Cincinnatiensis. 4 Lea. Chenu. 



*pustulatus. Lea. Chenu. Han. 

 Unio nodulatus. Con. 



*Schoolcraftii. 5 Lea. Han. 

 I ~n io prasimis. Con. 

 Unio nodiferus. Con. 



TRIANGULAR. 



*apiculatus. Say. Con. Chenu. Han. 

 *asper. Lea. Chenu. Han. 

 *Dorfeuillianus. Lea. Chenu. Han. 



*stapes. Lea. Con. Chenu. 



*tuberosus. Lea. Cht 



Han. 



' TRIANGULAR. 



*sparsus. Lea. Chenu. 



*rnetanevrus. Raf. Con. Kiist. Sh. 

 & Eat. Han. 

 Unio nodosus. Bar. Hild. Chenu. 

 Unio rugosus (Flat). Bar. Hild. 



Adams. 

 Telederma metanevra. Swain. 

 Mya nodosa. Eat. 

 Mya rugosa. Eat. 



*\Yardii. Lea. 



*interrnedius. Con. 



*cornutus. Bar. Han. 

 Mya '■>>nt n fa. Eat. 

 Unio reflexa? Raf. 

 Unio reflexus. Con. 

 Unio torulosus. Raf. fide Sh. & Eat. 



Han. 



SUBROTUXD. 



*pustulosus. Lea. Chenu. 



Unio verrucosus. Bar. Yar. b. 



Unio verrucosa. Valen. 



Unio verrucosus cdhus. Say; but not 



oiHiMreth. 6 

 Unio lidlatus. Con. 



*spa3ricus. Lea. 



*asperatus. Lea. 



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

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

 Lesueur. Mr. B., in his reclamation, recognizes his i-ugosus as U. Peru nana, Lam., which shell is 

 undoubtedly the plicatus, Lesueur and Say. 



2 This variety of asperrimus I have had in my cabinet for about twenty-five years, and always 

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



3 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. 



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



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

 opinion. 



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

 (nobis). 



9 



