258 THE NATURAL HISTORY OF 



SPECIES III. 



GAMMARUS ARCTIC US (LEACH), 



OR THE 



MOUNTEBANK SHRIMP OF SCORESBY. 



The characteristics of this animal are thus described by Dr. 

 Leach. " G. Oculis sublunatis ; pedum pari tertio, secundo 

 majori." It frequently tumbles over when in the water, 

 with singular celerity, yet swimming with equal ease and 

 rapidity in every position. The four feet are raised above 

 the back, whenever that part of its body comes into contact 

 with any solid substance. This species is discovered in all 

 parts of the Spitzbergen sea, even at a great distance from 

 land ; it also inhabits superficial water, and affords food for 

 whales and birds. 



SPECIES IV. 



GAMMARUS MYSTICETUS, 



OH THE 



WHALE SHRIMP. 



This is another species of this genus, to which I have given 

 this name in consequence of having seen immense quanti- 

 ties of this species in the mouths and stomachs of the BaWna 

 Mysticetus, during the period I was in Greenland. The 

 only peculiarity otherwise worth notice is the largeness of 

 its eyes. 



