76 WITH HARD CHEEKS. 



ACANTHOPTERYGII. WITH HARD CHEEKS. 



THE. ROUGH-TAILED STICKLEBACK. 



a 



BANSTICKLE, SHARPLiN. Scotland. 



Gasterosteiis trachurus, Cvv. et Valenc. Hist. Nat. des Poiss. t. iv. p. 481, 

 pi. 98, fig. 1. 

 ,, aculeutus, Block, pt. ii. pi. 53. fig. 3. 



,, ,, Donovan, pi. 11. 



• 

 Generic^ Characters. — Body without 'scales, more or less plated on the sides ; 

 one dorsal fin, with free spines before it ; ventral fin with one strong spine, and 

 no other rays ; bones of the pelvis forming a shield, pointed behind ; branchi- 

 ostegous rays 3. 



The Rough-tailed Three-spined Stickleback is 

 one of the smallest as well as one of tlie most common 

 of our fishes, and is found both in the salt and in the 

 fresh water : not only does almost every river, brook, and 

 lake produce this well-known species, but it is also 

 common all round the coast from the Land's End to the 

 Orkneys. 



Cuvier and Valenciennes first noticed that three species 



