Page:The Osteology of the Reptiles.pdf/164

the symphysial ends of the pubis and ischium became connected in many by ligaments, or cartilage (Fig. 120), and later in some by bone, producing a false obturator or thyroid vacuity on each side. A foramen or vacuity homologous with that in mammals, the so-called

Fig. 120. Pelvis and sacrum. A, Iguana (Lacertilia), pelvis from below; B, sacrum from below. About natural size. C, Dicynodon (Anomodontia), pelvis, from above and from the side. After Broili. Nearly one half natural size.