70 



FISH GALLliKY. 



Case 18. carnivorous littoral fishes, many of which have become accli- 

 matized in fresh water. It is represented in British waters by 

 several species of Gobius and one of Callionymus (Dragonet). 

 The latter family contains the Lump-suckers (Ct/clopterus), the 



Fi<r. 54. 





w 



Lump-sucker (Cyclopterua lumpus); with a separate view of the 



sucking-disk. 



common species (C. lumpus) occurring in North Europe and 

 North America. It is difficult to remove it from any object to 

 which it has once attached itself by means of its sucking-disk. 



The Pediculati or Sea-devils (Case 13) contain a larger number 

 of bizarre forms than any other; and there is, perhaps, none in 



