1895.] LOEirrs platopalliatus attd psittacus ebithacus. 325 



articular surfaces are slightly further apart. The centrum is 

 more laterally compressed and more vertically and also antero- 

 posteriorly extended, the hypapophysis is louger and trifid at its 

 extremity, the two catapophyses having descended nearly to its 

 apex. 



Kg. 13. 



plz 



ptz 

 Dorsal aspect of ISth to 19th vertebrae of Psittacus erithacus. 



d. Diapophysis. 

 kp. Hyperapophysis. 

 n. Neural spine. 



ptz. Postzygapophysis, 

 pz. Prezygapophysis. 



In L. jktvopalliatus the conditions are similar save that the 

 hypapophysis is simple, and that the centrum is not so much more 

 vertically and antero-posteriorly extended than is the last cervical 

 vertebra. 



In both species the centrum is extremely narrow transversely. 

 The hinder articular surface of the centrum is concave, but its 

 anterior ventral surface is slightly saddle-shaped in both species. 



The second dorsal vertebra is very like the first, but the hypapo- 

 physis, in P. erithacus, ends distally in a hook-shaped pointed 

 process which curves forwards beneath the hinder part of the body 

 of the preceding vertebra. ■ In L. fiavopalliatus the conditions are 

 generally similar. 



The central articular surfaces are convex anteriorly and concave 

 posteriorly. 



The third dorsal vertebra is very like the second, but the post' 



