ZOOLOGY 



angle, and describe it as it swims, with its foot and mouth 

 anterior, the visceral hump posterior, the mantle cavity ventral. 



Fig. 124. 



A. Loligo vulgaris, 

 a. Arms. 

 t. Tentacles. 

 C. Side view of one of the suckers, show- 

 ing the horny hooks surrounding the 

 margin. 



B. Pen of the same, reduced in size. 



D. View of the head from in front, show- 

 ing the arms (a), the tentacles (t), the 

 mouth (»!), and the funnel (/). ' 



and the shell or cuttle-bone, which may be felt through the 

 skin, dorsal. The most dorsally-placed pair of arms, really the 

 most anterior, are termed the first pair. 



Sepia, being a Decapod, has five pairs of arms, of these, 

 the fourth pair are unlike the others. They are much longer. 



