| OCR Text |
Show 314 DB. ST. GEOEGE MIVABT ON THE SKELETON OF [Apr. 2, cup, with a slight median notch above the perforation, the two portions bounding the latter dorsally not fusing together in the middle line but leaving a suture there. In P. erithacus (fig. 2, p. 313) the perforation is very much smaller and there is no suture above it. There is but a mere trace of a transverse process to be detected where the neural arch of the vertebra joins its lateral crura. Such a process is distinct in L. fiavopalliatus, and it extends not only outwards but somewhat ventrad. The hypapophysis (h) is also relatively larger, hastate in shape, and more pointed than in P. erithacus, while its median ventral ridge is less strongly developed. Fig. 3. D C Axis of Lorius fiavopalliatus. A. Anterior aspect. B. Dorsal aspect. C. Lateral aspect. D. Ventral aspect. h. Hypapophysis. pi. Pleurapophysial lamella. hp. Hyperapophysis. ptz. Postzygapophysis. n. Neural spine. t. Transverse process. o. Odontoid process. The axis in both (figs. 3 and 4) has a very small odontoid process (o), but only in L. fiavopalliatus a small perforated transverse process (t), the delicate pleurapophysial lamella (pi) exhibiting a minute postaxiad process on its hinder margin. The neural spine is relatively, as well as absolutely, smaller, and the postzygapophyses, with very prominent hyperapophyses1 upon them (hp), project more outwards and less backwards, making the lateral margin of the vertebra, seen dorsally, more concave. The hypapophysis (h) projects rather more backwards and less downwards, and the inferior margin of the vertebra, viewed laterally, is less strongly concave than in P. erithacus. The third vertebra (figs. 5-10), viewed laterally, has, in both species, the outer margin of the longitudinal groove on the ventral 1 So named by me in P. Z. S. 1865, p. 574,.and Trans. Z. S, vol. viii. p. 390. |
