3°4 



COLLEGE ZOOLOGY 



prawnlike crustacean called My sis (Fig. 217), and is said to be 

 in the Mysis stage. 



The shrimp, Penceus, passes through a number of interesting 

 stages before the adult condition is attained. It hatches as a 



Fig. 227. — Two later stages in the development of Penceus. A, Zocea 

 stage. B, Mysis stage. (From Korschelt and Heider, after Claus.) 



larva, termed a Nauplius (Fig. 226, A), possessing a frontal eye 

 and three pairs of appendages {A', A", Mdf.); this Nauplius 

 molts and grows into a Protozoan stage (Fig. 226, B), which bears 

 three more pairs of appendages and the rudiments of segments 

 III-VIII. The Protozoaa stage grows into the Zocea stage 



