OCR Text |
Show 1895.] LOEIUS FLA VOPALLIATUS AND PSITTACUS EEITHACUS. 327 zygapophyses (ptz) are again slightly smaller, the tubercular and capitular perhaps rather farther apart. There is no hypapophysis. The centrum is not quite so narrow transversely as it is in the first and second dorsal vertebrae. The articular surfaces of the centrum are again slightly convex in front and decidedly concave behind in both species. The fourth dorsal vertebra is very like the third save that its centrum is slightly shorter antero-posteriorly and not quite so compressed laterally, and that the summit of the neural spine ceases to bifurcate at its hinder end. The centrum is again convex anteriorly and concave posteriorly. The fifth dorsal vertebra has its centrum again somewhat shorter and less laterally compressed, and the articular surfaces for the Fig. 16. IC-.... IS Dorsal aspect of sacrum and pelvis of Psittacus erithacus. at. Antitrochanteric process. er. Median part of sacral escutcheon. es. Lateral part of the same. ic. Lateral iliac ridge. is. Ischium. Ic. Iliac crest. If Iliac fossa. Is. Ilio-caudal spine. of. Obturator foramen, pu. Pubis, |