Page:Synopsis of the Exinct Batrachia and Reptilia of North America. Part 1..pdf/35

 AND AYES OF NORTH AMERICA. Fig. 3. Fig. 4. NOTIIOSAUEUS ? ANDRIANX. External nostrils posterior. Pubes entering acetabulum, transverse, united medially. Vertebrae with zygapophyses only. Ribs single-headed. Chevron bones present. SAUROPTERYGIA.