THE METAMORPHOSIS OF A CRAB. 



213 



along its outer edge. These hairs are much more finely 

 plumose than those on the other mouth-parts. 



7. The first maxilliped (Fig. 109, Mp l ). This con- 

 sists of a large muscular protopodite, which carries an 

 exopodite (ex) and an endopodite (en) . The exopodite is 



FIG. 109. 



FIG. 109. Maxillipeds of the same zoea. (Drawn by W. K. Brooks 

 from a sketch by E. B. Wilson. ) 



Mp 1 . First Maxilliped. Mp' 2 . Second maxilliped. ex. Exopodite. 

 en. Endopodite. 



two-jointed, flattened, and is usually bent upwards against 

 the side of the carapace. It ends in four long, two-jointed, 

 plumose swimming-hairs. The endopodite is about as 



