132 NATURAL HISTORY OF OUR SHORES 



which seems the termination of the leg has also a claw, 

 and is complete without the "extra" ; this extension is thin, 

 and very flexible, having twenty or more joints, and it is 

 furnished with a delicate pair of pincers. These are no doubt 

 very useful to the possessor, enabling it to reach distant 

 morsels without the trouble of moving. A similar ap- 

 pendage to the human arm would be of service in various 

 professions. 



This crustacean is tolerably common under partly raised 

 stones in gravelly places ; much the same in habit as 

 Athanas, just described. 



fts eyes are large, and at night glow with a bright red tint. 



it is a very remarkable thing in an aquarium, these 'fed 

 gleaming eyes being strikingly conspicuous when it is too 

 dark to distinguish any form. 



We may now get to some more familiar forms, the Palce- 

 monidce or " Prawns." 



Palcemon serratus is the most common example. It is 

 about three and a half inches long. The rostrum (or " sword ") 

 is beautifully serrated on the upper margin, and is curved up- 

 wards ; it is about three quarters of an inch long, and pro- 

 jects beyond the little flat shelly prominences which are so 

 conspicuous in all the prawns, the squames of the antenna?. 



This elongated sword affords a ready method of dis- 

 tinguishing this species from the next, which in all other 

 respects closely resembles it. 



It is taken in rocky situations, either in rock pools or at 

 tide margin, by means of the circular hand net. It is also 

 taken in baited wicker traps in deep water. 



Palcemon squilla. This is not quite so common as the 

 last. It is shorter, and for its length somewhat stouter. 

 The rostrum is broader and shorter than in the last ; it does 

 not project beyond the squames of the antennae nor curve 

 upwards. 



This species is found in the same situations as the last, 



