and its Tributaries. 331 
is continuous with the caudal, which terminates a little behind 
the anal. The decurrent posterior dorsal involves in its course 
the rudiments of an immature adipose fin, which is not, how- 
ever, discoverable in every specimen. Tail truncate. 
Anal fin elongate and widened behind. 
Ventral fins ovate, small and horizontal. 
Pectoral fins short, rounded and horizontal. 
Color. Back and head yellowish olive ; sides yellow ; nose, 
throat and abdomen, white ; fins diaphanous, sligh tly dusky. 
Length from four to twelve inches. 
Hab. Mahoning River and Lake Erie. 
A.D. 1—7; A. 17; V. 8; P. 1—7 rays. 
Observations. The decurrent form of the adipose dorsal 
and caudal fins induced M. Rafinesque to separate it from the 
genus Pimelodus and constitute a new genus. The propriety 
of his course may, perhaps, be questioned, though I have fol- 
lowed it in preference to making a new synonyme. 
This species is occasionally taken, in seines and with hooks, 
near Cleveland, and, during low stages of water, I have fre- 
quently discovered it, beneath flat stones and logs, on the 
"pples in the Mahoning River, where it is called the young 
cat-fish by the fisherman. In that stream, it is, invariably, of a 
delicate bronzy-yellow, and of a less size than in Lake Erie. 
It might, perhaps, with propriety, be considered a distinct 
Species, 
Perca. Lin. 
P. flavescens. Mitchill. Yellow Perch. 
Bodianus flavescens. Yellow Perch. Mitchill, Trans, Lit. and Phil. Soc. 
P 2 NX» 421. i 
rca flavescens, Cuv. et Vab ii. p. 46 
& 
American Perch. Rich. Faun. Boreal. Amer. iii. p. 1. 
i pl. LXXIV 
se 
Bodia ; Common Perch of Ms. Storer’s Rep. p. 5. 
P, Jlavescens. Yellow Perch e Kirtland's Rep. pp. be ii 
"rea flavescens, Amer. Yellow Perch. Dekay’s Rep. p. 3, pl. I. fig. 1. 
" * “ M & Linsley's Cat. of Fishes of Conn, 
