THE CRAY-FISH. 81 



The general thickness of this creature is that of a 

 large pencil, but it varies according to the individual. 

 The length is from one foot to fifteen inches or so. 



There is a much smaller species of lampern called 

 the Pride, Sand-pride, or Mud Lamprey, which is 

 not more than half the length of the lampern, and 

 only about the thickness of an ordinary quill. This 

 creature has not the power of affixing itself like 

 the lampern, on account of the construction of its 

 mouth. 



Having now taken a hasty glance at the verte- 

 brated animals, we pass to those who have no bones 

 at all, Tand whose skeleton, so to speak, is carried 

 outside. Our representation of aquatic Crustacea, 

 as such creatures are called, will be the Cray-fish 

 and the Water-Shrimp. 



THE CRAY-FISH. 



Every one knows the Cray-fish, because it is so 

 like a lobster, turning red when boiled in the same 

 way. This red colour is brought out by heat even if 



