104 
ZI. 
ea 
33: 
34- 
35: 
36. 
37: 
FISHES. 
Sub-class 2: -VALEAOSTEL. 
Order 1. ACANTHOPTERYGII. 
Div. ACANTHOPTERYGII PERCIFORMES. 
Fam. PERCIDA. 
Perca fluviatilis Z. Perch. 
Freshwater resident, common, generally distributed in the 
middle and lower waters of the rivers, but not found in 
them at a greater elevation than 600 feet ; entirely absent 
from the Cleveland streams. In ponds and canals through- 
out the county—introduced. Occurs in Malham Tarn, at 
an elevation of 1250 feet, where Dr. Whitaker (History of 
Craven) says they become blind and black. We are, how- 
ever, informed by Mr. Walter Morrison that as regards 
their being black, such is not the case, though they are 
sometimes caught blind. 
Labrax lupus (Zacé.). Basse. 
Occasionally taken during the summer months off Whitby 
and Scarborough. 
Acerina cernua (Z.). Ruffe. Pope. 
Freshwater resident, not uncommon; irregularly distributed 
in the rivers of the lowland districts, and has also been 
introduced into canals and reservoirs. Formerly in the 
Calder and Lower Aire, and in some canals, but now 
exterminated by pollution. Generally known as ‘Tommy- 
barr.’ 
Serranus cabrilla (Z.). Smooth Serranus. 
Serranus gigas (Briinnich). Dusky Serranus. 
Polyprion cernium Va/. Stone Basse. 
Dentex vulgaris C & V. Sparus. Dentex. 
Doubtful. Said to have occurred at Scarborough (Murray, 
1832). 
