1895.] lORirS TLAVOPALLIATUS A?fD PSITTACrS ERITHACTTS. 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 fii'st 

 and second dorsal vertebrae. The articular surfaces of the centrum 

 are again slightly convex in front and decidedly concave behind in 

 both species. 



The fourtJi 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 neiiral 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. 



Dorsal aspect of sacrum and pelvis of Psittacus erithacus. 



at. Antitrochanteric process. 



er. Median part of sacral escutclieon. 



es. Lateral part of the same. 



ie. Lateral iliac ridge. 



is, Ischiium. 



fc. niae crest. 

 If. Iliac fossa. 

 Is. nio-caudal spine. 

 of. Obturator foramen. 

 pu. Pubis, 



