102 



THE OCEAN. 



pable of improvement, each filling its own peculiar 

 place in its own circle, which the others could not 

 fill. 



The Shrimp and Prawn, like the Lobster, have the 

 extremity of the body furnished with broad overlap- 

 ping plates, strongly fringed, which, expanding in 

 the shape of a fan, constitute a powerful fin. The 

 body, a little behind the middle, has a remarkable 

 bend downwards, though it may be brought nearly 

 Straight Their motion when swimming is very 

 swift, and in a backward direction, and is performed 

 by striking tlie water lbreibly with the tail-fin, the 



