412 THE ANGLER-NATURALIST. 



so closely resembles the common or River-Lampem as 

 frequently to be mistaken for it ; and it is possible that at 

 some period of the year both may migrate to salt or brack- 

 ish water from that part of a river within tidal influence. 



YOUNG OF FRINGE-LIPPED LAMPERN. 



(Pride, Sandpbide,Sandprey,Sand-lueker, Stone-Grig, 

 AND Mud-Lamprey.) 



This small fish, which has until lately been considered 

 as a separate species, has been discovered by Miiller to be 

 the young of the Fringe-lipped Lampem — although the dif- 

 ferences in structure are so great, that the assumption of the 

 adult form almost amounts to a transformation or meta- 

 morphosis, of a similar nature, though less in degree, to 

 that which takes place in the tadpole on becoming a frog ; 

 and there is every reason to believe that a somewhat simi- 

 lar change occurs in the case of the young of the other 

 Lampreys, thus opening a new and interesting field to the 

 researches of the naturalist. In the adult Lampreys, the 



