172 Enibryonic Development of Cliirouonius 



and already furnished witli appendages. The jaws are 

 three pairs of rounded prominences, and the antennae 

 large, blunt outgrowths from the lateral lobes of the 



sat 



St i^s%W^<L \ 





FiG. 126. — Sections of embryo before comi)letion of mid-p:nt. i, horizontal. 

 2, sagittal. &r, brain, st, stomodaenm (fore-gut), sal.g, salivary gland, mes, 

 mesenteron (mid-gut) n, nerve-cord, y, yolk, s.g, sexual gland. j)r, procto- 

 daeuni (hind-gut) 



head (fig. 



12: 



The prothoracic and anal feet are not 



3^et visible. The head is externally complete, and bears 



