GENERAL BIOLOGY 



697 



large fishes which, like the sunfish, have a layer of blubber 

 round their body, and may be seen floating at the surface, the 

 dorsal fin above the water (see Fig. 507). 



The organs of floating have previously been described and 



Fig. 507. 

 Mola rottmda, to show the thick fat covering under the skin. 



figured (see the Copepoda in Figs. 416-418, and the radiolaria 

 and foraminifera with siliceous and calcareous spines and filiform 

 pseudopodia, pp. 146-153). 



Of special interest to us, however, is the oceanic fauna, the 

 members of which are remarkable for their small size, and in 

 this fauna the fishes especially appeal to us. The whole tauna 



