PELVIC ARCH. 



97 



J> 



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

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



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



ACETABULTTM. 



.7, ilium ; Js, ischium ; P, pubis ; A, acetabular bone ; Ac, acetabuluna. 



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

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



