THE PELAGIC FAUNA AND FLORA. 



191 



gi'eater. Indeed, if their habits were similar to those of like 

 animals at the present day, they must have supplied a large part 

 of the animal food of deep-sea forms. The heteropods are rep- 

 resented by abundant specimens of Firoloidea (Fig. 112), many 

 fully sixteen inches long, associated with Pterotrachea ; Carina- 

 ria is also frequently seen. 



We know only enough of the habits of our cephalopods to 

 be able to state that some of the species, like Stenoteuthis, 



Fig-. 112. — Firoloidea. i 



Stauroteuthis, and the giant squids of Newfoundland, are un- 

 doubtedly pelagic at times, although the majority of the spe- 

 cies known to come from our coast have been dredged from 

 considerable depths. Many of the cephalopods have great 



Fig. 114. — Spirilla 

 Peronii. A. 



Fig. 113. — Argonauta. |. (Verrill.) 



Fig. 115. — Argonauta. 

 |. (Verrill.) 



freedom of locomotion, and equal fishes in their migrations, 

 often moving in schools. But it will always be difficult to fix 



