In. 



Lin. 



3 



4.5 



5 



3. 



3 



10. 





10.2 



5 



2.5 



11 



9. 



6 





1 



10.2 



4 





5 



3. 



7 



9. 



3 



7. 



50 THE EXTINCT BATRACHIA, REPTILIA 



Anteroposterior diam. ?llth dorsal, 



Transverse posterior of articular face, 



Vertical do. do. do., 



Transverse posterior of neural canal, 



Transverse posterior of articular face, 3d dorsal, 



Elevation centrum, arch and spine, 2d dorsal, 



Elevation upper edge zygantrum 2d dorsal, 



Length zygantrum, upper edge, do., 



Length centrum, last cervical, 



Width centrum articular face cervical, 



Elevation neural arch and spine cervical, 



Antero-posterior width neural spine of cervical at zygapophysis, 

 The cervical vertebra, are assumed to commence where the rib pits cease, and the continuous lateral processes 

 commence. This point is ascertained with difficulty on the specimen. It is, however, perhaps the same point where 

 the longitudinal lateral ridge leaves the upper margin of the rib pit ; and it was to the series of vertebrae which pass 

 this point, the scapular bones, — the clavicle and coracoid were found attached. On the anterior dorsals the inferior 

 margin of the rib pit is most prominent, and is finally produced in a flat thin process which is directed obliquely 

 downwards. Both these and the posterior ribs are crushed on the centra and project obliquely below them; their mode 

 of attachment is thus rendered rather obscure. A similar structure exists in the posterior cervicals of Cimoliasaurus, 

 while on the anterior dorsals or where the rib-origins are on the lower plane, short thick diapophyses support the ribs. 

 The proximal cervicals are remarkable for their compressed and elongate form. They are for a considerable distance 

 longer than any dorsals. The lateral longitudinal ridge rises successively nearer to the neural arch and disappears. 

 The articular surfaces are vertically oval, flattened above and below. The inferior faces are slightly grooved in line 

 with the venous foramina. These vertebrae diminish in length, and after the posterior third of the series, materially 

 in depth. They dimmish to terminal ones of very small size. In most the decurved '? pleurapophyses are broken near 

 the base, but the basal portion of various lengths generally adheres. They are as wide as a rib; and scarcely half as 

 thick. On some of the most anterior vertebrae, they are quite short and broad antero-posteriorly. They have much 

 greater antero-posterior extent on the terminal than the proximal cervical centra, having a base five-sixths the length 

 of the latter. The zygapophyses have relatively a larger size on these than any other vertebrae. In such the centrum 

 is less compressed, though with concave sides, and with a section rather quadrate. 



The caudal vertebree have slightly concave articular surfaces, which are not bounded by groove or ridge. The 

 neural arches have flat sides, and there is no longitudinal ridge above the diapophyses. The neural spines are 

 elevated, the margins of those of the adjacent vertebrae close together. The diapophysis is very short and wide, 

 terminating in a large oval concavity for the pleurapophyses. Each limb of the chevron bone is attached to an 

 articular surface on the lower posterior face of the vertebra, at the extremity of a strong inferior ridge. These inferior 

 ridges are rather close together, and distinguish the vertebrae from those of Cimoliasaurus magnus, where they are 

 wanting. They are absent on the anterior seven of the caudal series. The diapophysis is nearer the anterior than the 

 posterior face of the vertebra. The venous foramen is single and median, on all but the last six cervicals. 



Antero-posterior diameter of fourth caudal, 

 Transverse do., 

 Total elevation, 

 Vertical diameter centrum, 

 Anterior-posterior diam. diapophysial pit, 

 do. do. third cervical, 



Transverse do. do., 



Heads of fourteen ribs are preserved, and a great number of shafts. The heads are simple, with elongate oval 

 articular face. They are oblique in the narrow direction, and frequently in their length also ; the margins are 

 somewhat everted. The extremities of the diapophyses of the larger dorsal vertebrae are transverse, some flattened, 



In. 



Lin. 



2 



4 



3 



10.5 



8 





3 



1.5 



1 



9.2 



2 



2. 



2 



11. 



