Inches. 



Lines 



2 







1 



9 



1 



8 







11 



10 







4 



4 



WEALDEN FORMATIONS. 3 



close inspection it is seen to be everywhere impressed by fine, straight lines, decussating 

 each other at nearly right angles, and indicating the structure of the corium in which 

 the scutes were imbedded. Thus, from the size and strength of these dermal bones, 

 their degree of imbrication, and the structure for interlocking, we may conclude that the 

 Goniopholis was better mailed than the Teleosaur, which Cuvier regarded as " l'espece la 

 mieux cuirassee de tout le genre." 1 



In the slab in question the vertebras were all at right angles to the exposed plane, 

 and fractured across the middle, one extremity being buried in one of the halves of the 

 slab, and the other in the opposite half. By permission of the Trustees of the British 

 Museum, I proceeded, in 1841, to remove the matrix from the two extremities of 

 the same vertebra, and so demonstrated that both articular ends were equally but 

 slightly concave (PI. II, figs. 8, 9). 



The length of the body of the vertebra examined was 



Vertical diameter of the articular extremity 



Transverse diameter of the articular extremity . 



Ditto of middle of the body ...... 



Ditto of entire vertebra, including the transverse processes . 



Height of entire vertebra, including spinous process . 



From the lower part of the centrum to the base of the transverse 



process .......... 2 6 



The suture which joins the neural arch to the centrum is conspicuous ; it forms an 

 ascending angle or curve at its middle part. In the degree in which the body of 

 the vertebra expands to form the subconcave articular surfaces, in its smooth, non- 

 articular surface, and in the circular transverse contour at the lower part of the 

 centrum, Goniopholis resembles Streptospondylus more than it does Teleosaur us. 



The diapophyses of the lumbar and anterior caudal vertebrae are long, straight, and 

 comparatively slender ; those of the sacral vertebras are relatively thicker, and the 

 spaces enclosed by their expanded extremities are smaller than in either the Teleosaurs 

 or Crocodiles. The antero-posterior extent of the two sacral vertebras is three inches 

 two lines. 



The ilium is broader than in the existing Crocodilians ; the bifurcation of the 

 proximal end of the ischium is more marked, and the iliac branch is more regularly 

 rounded ; the pubic branch is longer, more slender, and its articular end is more 

 regularly convex ; the distal or lower part of the ischium expands into a relatively 

 broader plate. This character is still more conspicuous in the pubis, which equals the 

 ischium in breadth, and begins to expand much nearer the proximal extremity than in 

 the existing Crocodiles. In these modifications of the pelvis, as well as in the biconcave 



i t 



Ossemens Fossiles,' torn, v, pt. 2, p. 139. 



