193 
ASPEO. 
lu dividing the extensive family of Linnajan Perches, Cuvier forms 
the genus ^spvo, which, with a somewhat elongated body, has the two 
dorsal fins separate, the ventrals broad, the teeth very small and thickly 
set, head depressed. The teeth are on the palatine bones, but not on 
the tongue. 
RUFF. 
POPE. JACK RUFE. 
Perea jliiviatilis minor, and Sclvrollus, 
“ cernua, 
ft ft 
ft ft 
Gernua fluviatilis, Aspredo, Ituffa, 
“ fliwiatilis, 
Acerma vulgaris, 
a « 
JONSTON. 
LiNN*tfs. Blocu; ph 53. 
Dojjovan; pi. 39. 
Jenyns; Manual, p. 334. 
■WiLLOUGirBY; p. 331, tabi x. 14. 
Flehing; Br. Animals, p. 212. 
Cuvier. Guhtiier; Catalogue 
Br. Museum, vol. i, p. 72. 
Yabrell; British Pishes, vol. i, 
p. 17. 
This little fish is less widely distributed than the Perch, 
but it is common in the rivers of the midland counties of 
England, although not found in Cornwall and Devon, m 
Scotland, or the Isle of Wight. It is not mentioned by Mr. 
Thompson among the fishes of Ireland; but by Linnaeus and 
other continental writers it is said to inhabit the lakes of (at 
least the northern parts of) Europe. According to Professor 
Nilsson it is frequently met with in the middle and northern 
waters of Scandinavia, but is rare in the south. It is lively in 
its motions, and chiefly frequents those portions of the river that 
are rocky or strewed with stones and sand. In other respects 
it has much the same habits as the Perch, and is angled for 
