1895.] LORIUS FLAVOPALLIATTJS AJSB PSITTACUS EHITHAGUS. 389 



species, indeed in L. flavopalliatus it would be almost perfectly- 

 straight but for the fossa for the geniohyoid and the transverse 

 prominence in front of it. A faintly marked ciu-ved line (convex 

 postaxiad in P. erithacus with a sigmoid flexure, concave postaxiad 

 above and convex postaxiad below in the other species) descends — 

 from the dentary process in P. erithacus, from behind the dentary 

 process in L. flavopalliatus— to the dorsal margin of the fossa for 

 the genioglossus {yg). This fossa is much more marked in L. flavo- 

 palliatus, and, on account of the length of the symphysis, relatively 

 nearer the postaxial margin of the bone. In P. erithacus it is twice 



Fig. 12. 



Lateral aspect of mandible of Psittaciis erifhams. 



a. Articular prominence. 



ag. Angular process. 



c. CoroQoid process. 



d. Dentary process. 



pa. Postarticular process. 

 pc. Posteoronoid process. 

 pp. Prearticular process. 



Lateral aspect of mandible of Loritis flavopallialus. 

 (Lettering the same as in fig. 12.) 



or more as distant from its anterior margin as from the posterior 

 one, and it is boimded supero-anteriorly by an arched ridge, concave 

 backwards, just beneath which are one or two vascular foramina. 

 The fossa is wider and more shallow than in L. flavopalliatus, and 

 bounded infero-posteriorly by a bony ridge which constitutes the 

 postero-inferior margin of the symphysis (see figs. 16 & 17). In 

 L. flavopalliatus it is bounded supero-anteriorly by a very delicate 

 lamina of bone, in front of which is a rather wide transverse 

 prominence convex antero-posteriorly. Behind the fossa there is a 

 smooth portion of bone intervening between it and the postaxial 

 margin of the symphysis. 



