314 



DE. ST. GEORGE MITAKT ON THE SKELETON OF [Apr. 2, 



cup, with a slight median notch above the perforation, the two por- 

 tions 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 sutui-e 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. flavopalliatus, 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. 



Kg. 3. 

 D C 



.^F 



r^. 



Axis of Lorius flavopalliatus. 



A. Anterior aspect. 



h. Hypapophysis. 

 hp. Hj'perapophysis. 

 n. Neural spine. 

 o. Odontoid process. 



B. Dorsal aspect. C. Lateral aspect. 

 D. Ventral aspect. 



pi. Pleurapopbysial lameUs. 

 ptz. Postzygapophysis. 

 t. Transverse process. 



The axis in both (figs. 3 and 4) has a very small odontoid process 

 (o), but only in L. jlavopalliatus a small perforated transverse pro- 

 cess (<),the delicate pleurapopbysial lamella {pi) exhibiting a minute 

 postaxiad process on its hinder margin. The neural spine is rela- 

 tively, as well as absolutely, smaller, and the postzygapophyses, 

 with very prominent hyperapophyses ^ upon them Qip), project 

 more outwards and less backwards, making the lateral margin of 

 the vertebra, seen dorsally, more concave. The hypapophysis Qi) 

 projects rather more backwards and less downwards, and the 

 inferior margin of the vertebra, viewed laterally, is less strongly 

 concave than in P. erithams. 



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. 



