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HANDBOOK OF INVERTEBRATE 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 



