104 FISHES. 



Sub-class 2. TELEOSTEL 

 Order i. ACANTHOPTERYGII. 



Div. ACANTHOPTERYGII PERCIFORMES. 



Fam. PERCID-ffi. 



31. 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. 



32. Labrax lupus (Lacep.). Basse. 



Occasionally taken during the summer months off Whitby 

 and Scarborough. 



33. 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.' 



34. Serranus cabrilla (Z.). Smooth Serranus. 



35. Serranus gigas (Brunnich). Dusky Serranus. 



36. Polyprion cernium Val Stone Basse. 



37. Dentex vulgaris C. 6* V. Sparus. Dentex. 



Doubtful. Said to have occurred at Scarborough (Murray, 



