PELVIC ARCH. 



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FIG. 83A. PELVIS OF A SIX-DAYS' CHICK. (After A. Johnson.) 

 .77, ilium ; Js, ischium ; pb, pubis ; pp, pectineal process of pubis. 



FIG. 83B. DIAGRAM SHOWING THE RELATIONS OF THE PELVIC BONES TO THE 



ACETABULUM. 



J, ilium ; Js, ischium ; P, pubis ; A, acetabular bone ; Ac, acetabulum. 



-II 



FIG. 84. PELVIS OF Echidna.. (From the left side.) (After Gegenbaur.) 

 II, ilium ; Is, ischium ; P, pubis ; Om, marsupial bones ; Fo, obturator foramen. 



H 



