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HANDBOOK OF INVEBTEBEATE ZOOLOGY. 



without dissection, and the young stages are therefore more 

 favorable than the adult crab for studying the organ. 



Fig. 117. — Young crab which moulted from the Megalops shown in 

 Fig. 110. (Drawn from nature by W. K. Brooks.) 



Place a megalops larva in a watch-crystal, in a few drops 

 of water, and covering it with a thin glass cover, to keep 



