EVIDENCES FROM EMBRYOLOGY 



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fundamental features at least, the structural condition of the animal's 

 ancestors. Naturalists believe that all backboned or vertebrate 



Fig. 26 —Stages in the development of the prawn, Pcncus potimirium. A 

 Nauplius larva; B, first zoea stage; C, second zoea stage. {From Jordan and 

 Kellogg, after Fritz Midler.) 



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Fig. 27. — Later stages in the development of the prawn, Pcncus potimirium. 

 D, Mysis stage; E, adult stage. (From Jordan and Kellogg.) 



