FORM, GROWTH, AND CHANGE 43 



...md 

 '..-ant 



- TTIX, 



!m 



c 



FIG. 23. HATCHING OF LARVA OF DRAGON-FLY (A lldX pa 



A, Egg containing developed embryo. 3, C, Emergence of larva enclosed in sheath. D, E 

 Emergence of larva from its sheath, ped, stalk of egg ; hv, head-vesicle ; ch, cephalic heart 

 m, stomach ; cl, face ; Ibr, labrum ; ant, feeler ; md, mandible ; mx, maxilla ; Im, labium 

 pi 3 , legs ; rv, rectal valves ; ad, dorsal appendix ; a, anus ; br, branchial basket ; d, dorsal 

 air-trunk; esh, egg-shell ; prs, empty sheath. xso. From Tillyard, " Biology of Dragon-flies". 



