Fig. 16

Cross-section of Thylogale billardierii (ZIUT, HL 13Â mm) at the level of the hypophysis. The chondrocranial braincase wall if formed by the lamina ascendens of the ala temporalis and the membrana sphenoobturatoria, which in this specimen have started ossification. Numbers of the histological serial sections are indicated at the bottom right of each figure. Numbers ascend in caudal direction