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THE OSTEOLOGY OF THE REPTILES
malian names astragalus and calcaneum and abandon the names tibiale, fibulare, and intermedium for the reptilian tarsus. Of the
Fig. 153. Limbs: A, Mesosaurus (Proganosauria). Modified from McGregor. Natural size, B, Sauranodon (Protorosauria). Modified from Lortet. Three fourths natural size.
centralia the most probable theory is that the fourth of the amphibian tarsus has united with the astragalus, the third with the fourth tarsale. The second is known to fuse with the astragalus in the
