178 OUTLINES OF ICHTHYOLOGY. 



The following is a classification, according to 

 their families, genera, &c., of fish inhabiting British 

 fresh waters. It will be observed that with the ex- 

 ception of the Lampreys and Lamperns the whole 

 of them belong to the first series, which we have 

 seen consist of the True, or bony, fishes. The 

 Lamperns and Lampreys belong to the second, or 

 Cartilaginous, series of fish. 



In this list I do not include doubtful species, 

 such as the so-called Loch Leven Trout; Gold 

 and Silver fish (the common gold fish of the 

 aguaria) ; Golden Tench ; or Salmo Fontinalis, 

 and other species of an admittedly non-indigenous 

 character, or only recently acclimatized. 



In regard to the technical names of the fish, the 

 first indicates the genus, and the second the spe- 

 cies, as, for example, Perca fluviatilis Perca re- 

 presenting the genus, and fluviatiKs the species 

 the Perch of the river, and so on. 



IST SERIES. 

 TRUE, OR BONY, FISH. 



ORDER I. 

 Spiny-finned Fish. 



Family i. Perches PERCID^E. 

 Species. 



Perch. (Perca fluviatilis^} 

 Ruffe, or Pope. (Acerina vulgaris.) 



Family 2. FISH WITH HARD CHEEKS. 

 Species. 

 Bullhead, or Miller's Thumb. (Coitus gobio.) 



