Chapter Twelve 



CRUSTACEA 



1. COPEPODA 



2. CIRRIPEDIA 



3. MYSIDACEA 



4. EUPHAUSIACEA 



5. AMPHIPODA 



6. ISOPODA 



7. STOMATOPODA 



8. DECAPODA 



(Copepods) 



(Barnacles) 



(Mysids; Opossum Shrimp) 



(Euphausids) 



(Amphipods; Beach Fleas; Scuds; etc.) 



(Isopods) 



(Squill) 



(Shrimps, Lobsters, Crabs, etc.) 



COPEPODA 



(Copepods) 



To this group belong a great many very minute 

 forms which are of great importance because they 

 form a large part of the food of many fishes. Many 

 copepods live on the surface of the sea and may be 

 collected by means of a "tow net" or "plankton 

 net," usually made of fine silk or bolting cloth to the 

 end of which is attached a small bottle. This net 

 is dragged behind a slowly moving boat and these 

 minute creatures are gathered by the net and con- 

 centrated in the bottle. Small jellyfish and other 

 plankton or floating animals are obtained in the 

 same way. Many more species of copepods live in 

 the sand along beaches and off-shore bars. 



In addition to the great many free living cope- 

 pods, there are numerous species that are para- 

 sitic on fishes and other sea animals. 



The copepods are too minute to be seen by the 



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