1895.] LOBIUS FLAVOPALMATTJS AJSD PSITTACUS EBITHACTIS. 373 



It juts outwards just beneath the ventral margin of the root o£ 

 the sphenotic process. 



The lamella of bone behind the meatus presents a rather wide, 

 somewhat undulating surface, which is bounded dorsally and pre- 

 axially by the more postaxial part of the ridge bounding the 

 temporal fossa below, while, more postaxially, it is bounded by a 

 continuation of the same ridge running downwards and slightly 

 backwards (concave forwards) to a junction with the lateral (and 

 descending) part of the lambdoidal ridge, where a slight process 

 or prominence — which may be distinguished as the exoccipital 

 prominence {ejj) — appears at their junction. From that point 

 the postaxial margin of the postmeatal lamella presents an outline 

 strongly concave baekv^ards till it reaches the apex of the iufero- 

 lateral part of the lamella, which apex projects outwards, back- 

 wards, and somewhat inwards as the paroccipital process (par). 



In L. Jlavopalliatus the conditions are the same, save that the 

 temporal fossa is somewhat smaller relatively as well as absolutely, 

 and that a postsquamosal prominence at the junction of the very 

 slight ridges bounding the fossa dorsally and ventrally is rudi- 

 mentary. The auditory opening also is limited in front for almost 

 its whole extent by a very delicate lamella of bone which descends 

 behind and close to the ascending process of the quadrate (see 

 fig. 1). The postaxial margin of the aperture is deeply concave for 

 the upper two-thirds of its extent, while beneath this the margin 

 is no longer concave but slightly convex. 



The undulating lamella of bone behind the meatus is of a dif- 

 ferent shape from that of P. enthacus, being relatively broader 

 (antero-posteriorly) dorsad and narrowing more rapidly ventrad. 

 The very faintly marked exoccipital prominence is at a slightly 

 higher level, and the postaxial margin of the lamella is nearly 

 straight, extending forwards (preaxiad) as it proceeds downwards 

 till it comes to the root of the paroccipital process {par), which is 

 bent more sharply backwards than it is in the last-named species. 



The outer surface of the postauditory lamella is somewhat less 

 grooved and concave than in P. erithacus, but, as in that species, its 

 ventral part is convex both dorso-ventrally and antero-posteriorly. 

 Its anterior and posterior surfaces meet together as a sharper ridge 

 than in the Grey Parrot. 



The quadrate (q), as seen in this lateral view of the cranium, 

 instead of having a nearly straight or only slightly convex margin 

 (more than two-thirds the length of its ascending process), as 

 in P. erithacus, has in L. jlavopalliatus a dorsally, very convex 

 margin not half the length of the ascending process. In both, 

 however, it almost continues onwards postaxiad the dorsal margin 

 of the zygoma, that bone articulating with the outstanding (zygo- 

 matic) process of the quadrate, which projects to about the same 

 extent, relatively, in both species. 



The postaxial margin of the quadrate is in both longer than the 

 dorsal one ; but while in P. erithacus it is somewhat rounded yet 

 separable from the ventral margin by an obscurely-marked angle. 



