MARINE ARTHROPODS 



265 



jointed abdomen has also a tuft of bristles at its extremity. The 

 annexed illustration represents some marine species, and will serve 

 to show the general features of the order. 



FIG. 196. A GROUP OF MARINE COPEPODS, MAGNIFIED 



The sea-side naturalist, intent on the collection of small life, 

 may possibly meet with representatives of two other orders of 

 crustaceans the Ostracoda or shelled crustaceans, the bodies of 



FIG. 197. A GBOUP OF OSTBACODE SHELLS 



which are enclosed in a bivalve, hinged shell ; and the JBrancMo- 

 poda, so called because the branchiae or gills are attached to the 

 feet. 



The Ostracodes have two or three pairs of feet which subserve 



