114 



RECORDS OF THE ALISTKA],IAN MUSEUM. 



cesses. The general foi-m of the eighth vei'tebra will be best 

 comprehended b}' leference to the figures depicting the lateral 

 and ventral aspects (PI. xxvii., figs, ia, 4c'). 



The DORSAL vertebrae are ten in numbei-. The first is shorter 

 than the second and has a depressed centium with two concave 

 articulai' surfaces in front, it bears a short rib connected with the 

 second rib. The venti'al aspect of this vertebra together with 

 portion of the carapace to which it is attached is shown in PI. 

 xxvii., fig. 5c-. 



The second to the seventh vertebne, inclusi^■e, are long and 

 strongly compressed but do not form a distinct ventral keel. 



The eighth is rounded below, and the ninth bears on its anterior 

 ventral surface a deep pit nearly as wide as the centrum itself. 



The tenth vei'tebra is short with a posterior condyle, the tenth 

 rib is connected directly with the carapace and does not abut on 

 to the preceding rib. 



The following free vei'tebr;e are absent, but the nature of the 

 parts remaining shows definitely that the pelvis is not anchylosed 

 to the carapace and plastron. Dr. Hans Gadow"' writes as though 

 the pelvis was known : "the skeleton, notably the plasti'on, pelvis, 

 and skull, conform with the Pleurodirous type. " 



Carapace. — The carapace measures 430 mm. in length and 

 330 mm. in breadth. During, probably, immature life, it 

 received an injury, having apparently been crushed between the 

 right anterior and left posterior aspects, i-esulting is distortion of 

 the former and breaking of the lattei', one of the marginal plates 

 also being cracked : these defects will be seen in PI. xxiv. and 

 fis. 32. 



Pig. 31. 



The posterior" dorsal keel is extremel}- marked, much more so 

 than in the type : the relative contours are illustrated in the 



•^ Gadow— Cambridge Nat. Hist., viii., Reptiles, 1901, p. 404. 



