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Order I. Apodes. No ventral fins. 



Genus Muraena. 



Muraena Anguilla. The Eel. Three species 

 found in England. 



Order II. Jugulares. Ventral fins "before the pectoral. 



Genus Gadus. 



Gadus Lota. Burbot or Eel-pout. 



Order III. Thoracici. Ventral fins under the pectoral. 



Genus Cottus. 



Cottus Gobio. Bull-head, or Miller's thumb. 

 Genus Perca. 



Perca Fluviatilis. Perch. 



. . . Cernua. Ruff or Pope. 

 Genus Gasterosteus. 



Gasterosteus Aculeatus. Stickleback. Three 

 species. 



Order IV. Abdominales. Ventral fins on the ab- 

 domen, behind the pectoral. 



Genus Salmo. 



Salmo Salar The Salmon. The fry, or young 

 salmon, are called smouts; and, on their 

 return from the sea to fresh water, -when 

 they mostly weigh from three to six pounds, 

 they are termed grilse or gilse. 



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