Plate XIV. — Members of the pelagic fauna, considerably magnified. 



The animals shown here belong to the plankton or drifting fauna, so called 

 because its powers of swimming are insignificant compared with the 

 strength of the currents of the sea. They derive their food from minute 

 floating plants, and in turn serve to feed larger pelagic animals, such as 

 the great jelly-fish, herrings, and whales. 



i, Noctiluca.) a large, phosphorescent flagellate ; 2, medusa of a hydroid ; 5, a 

 worm related to Nereis ; 6, a crustacean related to Cyclops ; 8, the Arrow 

 worm {Sagitta) ; 3, 4, 7, larva? of a sea-urchin, a worm related to Nereis, 

 and a crustacean related to the lobsters. Many other bottom-living forms 

 are distributed in larval phases such as these (see p. 325). 



