OCR Text |
Show 1895.] LORIUS FLAVOPALLIATUS AND PSITTACUS ERITHACUS. 393 ventrally. This is the surface which articulates with part of the zygomatic process of the quadrate as before described 2 From beneath the hinder end of the internal angular process a stronc rklce runs backwards, downwards, and outwards to the angular process (ag). The apex of this process is bent more inwards in P. erithacus and is relatively shorter. It is longer and its dorsal surface presents more of a concavity in L. flavopalliatus. Preaxial aspect of mandible of Lorius flavopalliatus. a. Arptaic.u lPaors tparrotmiicnuelnacr ep rocess. ag. Angular process. c. Coronoid process. pp. Prearticular process. Preaxial aspect of mandible of Psittacus erithacus. (Lettering the same as in fig. 18.) The mandible viewed in front shows the antero-dorsal margin in L. flavopalliatus in the form of an inverted pointed arch, an angular process extending much ventrad, and an apparently very slender transverse bony bar at the symphysis. In P. erithacus this bar is much stouter, the angular process less extended ventrad, and the antero-dorsal margin resembles an elliptical arch inverted; the defect of ossification in each ramus is also conspicuous. 1 See above, p. 374. |