1895.] LORIUS FLATOP.-O/LIATUS AND PSITTACU3 ERTTHACUS, 375 



and at its preaxial end sends forwai'ds a sharply projecting 

 anterior jxdatine process (see p. 378, figs. 6 & 7, two processes 

 behind the end of the line running inwards from the letters sp). 

 Behind this attachment it descends backwards with a slightly 

 irregular margin in P. eriihacus, which runs on into that of a 

 strongly-marked posterior palatine process (fig. 2, pp). In L. flavo- 

 palliatus this part of the postero-superior mai-giri is still more 

 irregular, presenting two blunt processes, one behind the other, and 

 projecting dorsad and postaxiad almost at right angles to the general 

 trend of the palatine. There is, however, only a very minute pos- 

 terior palatine process (fig. 1, pp), which projects from behind the 

 base of the more posterior of the two marginal processes just 

 mentioned. 



The antero-superior margin is, in both species, strongly concave, 

 with a foramen {for) opening a little behind its middle portion. 



The antero-inferior margin of the palatine is elongated, slightly 

 concave, and somewhat thickened and rounded in P. erithacus. In 

 L. jlavopalliatus it is relatively, as well as absokitely, shorter, much 

 more concave, and less thickened and rounded. 



The poster o-inf trior margin of the bone is the shortest of all in 

 both species, and is strongly concave postaxiad; but in i^.^a^o- 

 palUatus this concavity is mainly produced by the prominence of 

 the rounded angle between antero-inferior and postero-inferior 

 margins of the bone, while in P. erithacus it is chiefly owing to 

 the great extension backwards of the long and pointed posterior 

 jjalatine process, which, as before said, is but a minute process in 

 L. Jlavopalliatus. 



On the outer surface of the palatine two ridges run, in both 

 species, postaxiad and ventrad, diverging backwards from the base 

 of the anterior-palatine process, the inferior ridge {p) going to 

 that of the posterior palatine process. 



Ventrad of the lower of these two ridges, the surface in L.jlavo- 

 palliatus is convex in both directions for most of its anterior half, 

 and concave (especially dorso-ventrally so) for slightly more than 

 its posterior half (fig. 1, p). In P. erithacus this convexity is 

 hardly to be traced, while the concavity just described is less 

 marked. 



The most dorsal portion of each palatine is inflected mesiad, and 

 so is much hidden when the cranium is viewed laterally, and can 

 be best perceived when the ventral and inner surface is looked at 

 (figs. 6 & 7). The higher of the above-mentioned two diverging 

 ridges coincides with the line of inflection. The inner surface of 

 the palatine will be noticed when the cranium as seen on its ventral 

 aspect is described. 



The divergences, as regards the angles formed by the margins of 

 the palatine with each other, are given after the list of cranial 

 dimensions. 



In both species the pterygoid {pt), thus laterally viewed, is a 

 slender bar of bone of equal breadth save that it expands slightly 

 at its articulation with the quadrate. It appears below the zygoma 

 in P. erithacus, diverging from it very slightly ventrad and post- 



