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VERTEBRATA. 



ANACANTHINI. Fins without spinous rays. Ventral fins, when 

 present, either pectoral or abdominal. Scales cycloid or ctenoid. 

 Air-bladder not always present. 



Salt-water fish, mostly very voracious. Pleuronectidce have 

 unequally developed sides, the upper coloured, the lower white ; 

 the eyes are normally placed in the young, but one of them 

 passes gradually to the other or upper side ; they are either on 

 the right side or the left according to the species. They have 

 been separated as an order under the name of Heterosomata. 

 Of the remaining families the Anacanthini Gadoidei of Giin- 

 ther nothing can be said collectively, except that their scales are 

 very small or wanting. The burbot (Lota vulgar-is) and the 

 " freshwater trout" of Australia and Tasmania (Cradopsis mar' 

 moratus) are river-fish. 



