xvi BRITISH FRESHWATER FISHES 



Subclass Teleostei. 

 Order I. IsosroNDYLl. 



Family Salmonidae {Salmo?i, Trout, etc.). 

 „ Argentinidae {Smelt). 

 „ Clupeidae {Shad). 

 Order 2. Haplomi. 



Family Esocidae {Pike). 

 Order 3. Apodes. 



Family Anguillidae {Eel). 

 Order 4. OSTARIOPHYSI. 



Family Cyprinidse {Carp, Roach, etc.). 

 „ Cobitidae {Loaches). 

 Order 5. AnaCANTHINI. 



Family Gadidae {Burbot). 

 Order 6. Fercomorphi. 

 Family Serranidae {Bass). 



„ Percidae {Perch, Ruffe). 

 „ Mugilidae {Grey Mullets). 

 „ Cottidae {Miller's Thumb). 

 „ Gastrosteidae {Sticklebacks). 

 Order 7. Heterosomata. 



Family Pleuronectidae {Flounder). 



All the fishes of the fresh waters of the British 

 Isles, except the Lampreys and the Sturgeons, are 

 Teleosteans, and have the skeleton well ossified. It 

 would be out of place to treat of the comparative 

 anatomy of the various orders and families of this 

 group, but it is necessary to give some account of the 

 topography of a Teleostean fish and some explanation 

 of the terms used in classification and in the distinction 

 of species. 



In form the fish is usually moderately elongate and 



