10 



COMPARATIVE ANATOMY 

 J? 



Fig. 8, A, B, AND C. DIACIJA.MS iLU-sTKATiNo TIIK FORMATION OF THE AIMNION, 

 ALLANTOIS, AMD YOLK SAC. A AND II, IN LONGITUDINAL SECTION; C, IN 

 TRANSVERSE SECTION. 



A, amnion ; AF, anmiotic fold; Ah, amniotic cavity; Af, allantois ; C, note- 

 chord ; Dh, alimentary cavity ; Do, yolk-sac: ; E, body of embryo ; M, 

 medullary cord ; pp, coelome ; a, somatopleiue ; h, splanchnopletn e ; f, vitello- 

 intestinal duct. 



