L. Agassiz on Fishes from Tennessee River. 307 
species of Ammblodon in different parts of the United States and 
that this type is not limited to the Northern States but extends 
West as far as the western parts of Missouri aid South as far as 
Louisiana and Alabama. 
Ampiovon, Rafin.—External characters of Corvina, combined 
with the form and appearance of Pogonias. Upper pharyngeals 
distinct, covered with broad, hemispherical teeth closely set, like 
pavement stones and arranged in regular rows; outside of these 
are a few small poiuted teeth. ‘The lower right and left pharyn- 
geals are soldered toyether into a broad triangniar plate, covered 
with teeth of the same kind and arranged ini the same manner as 
upon the upper pharyngeals. In the genus Corvina the lower 
pharyngeals are distinct as the upper ones atid support short coni- 
cal teeth not numerous, nor closely set. Fyrom want of a snffi- 
cient number of specimens { am unable to determine whether the 
Specimens from the great Lakes are specifically identical with 
h Ohio River described by Rafinesque as Amblodon 
grunniens ; but I have ascertained that the species of the Ohio 
~ River differs from that of Huntsville, which I call Amblodon con- 
ciunus, Agass. This species differs from A. gruimiens in having 
the body less elongated, the profile steeper, and the dorsal fin 
Placed further forwards. he profile is most arched immediately 
over the upper aitachment of the preopercle, in A. granniens 
it is most prominent over the opercule. ‘The dorsal fin ends 
slightly in advance of the hase of the pectorals; in A. grunniens 
ehind these. The serrated edge of the preopercle is directe 
more obliquely downwards and backwards, making the inferior 
angle of the preopercle more acute. ‘This species is known in 
the Tennessee River by the name of Drum. It reaches there the 
Weight of fifty pounds. 
Amblodon lineatus, Agass.—This species sent to me by Mr. 
0. Stolley from the Osage River, Mo., resembles more A. con- 
Cintns than A. grunniens, but the head is shorter; the promi- 
hence of the foréhead is nearer the dorsal fin, immediately over 
the opercle, thus having a less arched profile. ‘The anterior 
border of the eye nearly reaches the profile of the head. The 
-Spines of the dorsal fin are bent more backwards. The dark col- 
ation of the centres of the scales, especially in younger speci- 
_ Mebs produces the appearance of regular lines following the di- 
_ Féetiou of the rows of scales, hence the name of this species. It 
stows also very large, 0 
mM as the species of the Tennessee River. Mr. Stolley in- 
forms me that the Amblodons are very sluggish, and live at the 
bottom of muddy waters, where they are often seen progressing 
Owly, raising as it were, clouds of dirt before them, now lying 
"pon one side of their body, then turning upon themselves 
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