AN AUSTRALIAN SAUROPTERYQIAN — ETHERIDQE. 29 



As regards P. sutherlandi, I have endeavoured to supply further 

 details than those given by Sir F. McCoy from an examination 

 of the type specimens, kindly placed at my disposal by him, 

 supplemented by additional material from Queensland.* I believe 

 C. leuoscopelus to be distinct from both these forms. The flattened 

 articular portions of the centra in P. sutherlandi, and the " more 

 flattened than concave " centres of the cervical vertebrae appear 

 to separate this species. In P. viacrospondylus the edges of the 

 articular surfaces of the centra are rugose, and thereby wholly 

 difier from those of our form. 



Of the New Zealand species, C. australis, Owen (+ P. crassi- 

 costatus, Owen),t possesses cervical vertebrae with flattened centra 

 terminations, a distinct median pit in each, four hjemal foramina, 

 and the neural arches and ribs persistently independent of the 

 centra. The difierence between this and the corresponding struc- 

 ture in C. leuoscopelus is manifest. In C. hoodii, Owen, J the 

 haemal surface of the cervicals is broad and flat, and there is no 

 special transverse oblong depressions in the middle of the articular 

 surfaces of the centra. 



The cervical vertebrae of P. hohnesi. Hector,§ have flat terminal 

 faces, and a humerus referred to this species, has the articular 

 head divided by a bicipital notch, not a groove as in the present 

 case. 



P. traversi, Hector,|| and P. mackayi, Hector,** are less known 

 forms ; the tirst is said to possess quadrate vertebral centra. 

 Lastly, the absence of cervical vertebrae in the type specimens of 

 C. caudalis, Hutton,f i renders a comparison diflicult. 



* Etheridge, Junr., Ann. Eep. Dept. Mines N.S.W., 1887 [1888], p. 167, 

 t. 1, f . 1-4. 



t Geol. Mag., vii., 1870, p. 51, t. 3, f. 4-5. 



t Ibid., f. 1-3 ; Hector, Trans. N. Zealand Inst., vi., 1874, p. 343. 



§ Hector, loc. cit., p. 344. 



II Ibid., p. 344. 

 *» Ibid., p. 345. 

 ft Ibid., xxvi., 1894, p. 354. 



