80 



FISH GALLERY. 



[Case 17.] which never enters salt water. It is locally distributed in Central 

 and Northern Europe and North America; it is one of the best 

 freshwater fishes, and exceeds a length of three feet. 



Fig. 65. 



The Burbot {Lota vulgaris). 



The Opkidiidce are small Gadoids with more or less elongated, 

 naked or scaly body. The " Sand-eels " or u Launces " (Ammo- 

 dijtes, fig. 66) occur on the British coast, and are well known 



Fisr. 66. 



The Sand-eel (Ammodytes lauceolatm). 



for the incredible rapidity with which they bury themselves in the 

 sand ; they are much sought after for bait. 



The Macrurida (fig. 67) are deep-sea Gadoids of curious shape, 

 occurring at depths of from 120 to 2600 fathoms. This family, 

 known a few years ago from a few species only, proves to be one 

 which is distributed over all oceans, occurring in considerable 

 variety and great abundance. About 40 species are known, of 

 which many attain a length of three feet. 



The Pleuronectida? are called Flat-fishes, from their strongly 

 compressed, high, and flat body. In consequence of the absence 



