562 CEPHALOPODA. 



nature. In the powerful and rapacious Onychoteuihis (fig. 282), the 

 cupping-glasses which arm the extremities of their long pair of muscular 

 arms are rendered still more formidable ; for from the centre of each 

 sucking- cup projects a strong and sharp hook, which is plunged by the 

 action of the sucker deeply into the flesh of struggling or slippery prey, 

 and thus a firm and most efficient hold upon the seized victim is secured. 



Fig. 282. 



I I 



A B 



Onychoteuthig, showing the structure of the arms. 



Nor is this all that claims our admiration in the organization of the 

 arms of Onychoteuihis : at the base of each fleshy expansion that supports 

 the tenacious and fanged suckers above described is a small group of 

 single adhesive disks, by the assistance of which the two arms can be 



