L, Agassiz on Fishes of the Tennessee River. 361 
C@LACANTHS, Agass.—Until an extensive and minute 
comparison of all the representatives of the genus Amia from 
different parts of the United States can be made tovascertain the 
true value upon which the different species described by Rich- 
ardson, De Kay and Valenciennes, are founded, it may be sufficient 
to mention here the existence of that genus in the waters of the 
Tennessee under the name of 
Amia calva, L, which has long been considered and may in 
reality be the only one of the genus. It is known at Huntsville 
under the name of Scaly Cat and Carp. Found in Mill ponds. 
SILUROIDS, Cuv.—Two species of this very natural family 
have been sent to me from Huntsville by Dr. Newman. 
Pimelodus cerulescens, Rafin.—Channel Cat. Grows very 
large and weighs occasionally over one hundred pounds. 
Pimelodus Catus, Lin.—Several species are confounded under 
this name ; but it is impossible to characterize them without en- 
tering into details which would be out of place in this short no- 
tice. Called Mud Cat at Huntsville. 
STURIONES, Cuv.—Two species of Sturgeons occur in the 
Tennessee, specimens of which I have received from Dr. New- 
man. 
Acipenser rubricundus, Lesueur. 
Acipenser maculosus, Lesueur. 
These two species have been considered as synonymous b 
Some ichthyologists. It is true that the young A. rubicundus 
like all young Sturgeons are more or less maculate, and yet there 
are so many other differences between the two specimens I have 
before me, which are nearly of the same size, that I can hardly 
consider them as identical. ‘The whole genus requires a thorough 
revision and would be an interesting subject for a monograph. 
here are some genera of North American fresh-water fishes 
the absence of which surprises me in the collection sent by Dr. 
ewman, and mention them with the view of calling attention 
- 88 specimens of the Salmon? JLabrar, known everywhere as 
White Perch. The presence of the genus Perca seems more 
doubtful. Chatessus, generally known as Hickory or Gizzard 
Shad. I fancy that the Stilbe obesus mentioned above, was mis- 
taken for a small specimen of this type. Hyodon, known as 
Toothed Herring. Anguilla, the Eel. Lota, known as Barbot 
or Relpout. The genus Pogostoma, of Rafinesque, is evidently 
Synonymous with Lota. Polyodon, known as Shovelbill, and 
Petromyzon, the Lamper-eel. I should also expect a long-billed 
