648 



PROF. H. G. SEELEY ON THE REPTILE 



the base. In the thirteenth and fourteenth vertebrae the centrum 

 is 1 t 7 -q inch long, with the articular face 1-^- inch wide in front and 

 rather less behind, while the depth in front is 1 inch. The neural 

 arch is small, and its superior outline horizontal. The measurement 

 from the middle of the base of the centrum to its upper border is 

 lfa-inch. The neural canal indents the centrum concavely at both 

 back and front articulations ; and from the hinder limit of the neural 

 arch a vascular groove impresses the sides, descending slightly for- 

 ward to the middle of the base. The centrum here is most con- 

 stricted, and measures y 8 ^- inch from side to side, and has a rather 

 less depth. The chevron bones are preserved in the thirteenth ver- 

 tebra, with the posterior margin of which they appear to be blended ; 

 they unite below in a V _sna P e ? an d have facets for the succeeding 

 vertebra. They are inch wide, -J-J inch deep, and, with the 

 groove at the terminal end of the centrum, enclose the vascular 

 canal. Of the fifteenth vertebra only half the centrum is pre- 

 served. The sixteenth and seventeenth are blended together, and 

 the chevron may not have united in the median line. The vertebras 

 now become roughened with many slight longitudinal muscular 

 ridges, indicative of the near approach of the end of the series ; and 

 the articular faces of the centrum appear to have central con- 

 cavities. 



Ribs. 



(See Blinzel, pi. iii. figs. 5, 6, pi. viii. figs. 14, 15, pi. i. fig. 27.) 



One cervical rib is preserved ; there are about half a dozen tolerably 

 perfect dorsal ribs, and a multitude of fragments of dorsal ribs. The 

 majority of these obviously belong to one animal; and I refer them 

 to the smaller of the two large Dinosaurs, Cratceomus hpidophorus ; 

 but there are a few slightly larger fragments which possibly pertain 

 to the larger Dinosaur. They are, however, too imperfect to yield 

 any characters for description ; and as they are doubtful remains, I 

 prefer to leave their elucidation to future discoveries. They are 

 larger and stouter than the bulk of the specimens. The only ex- 

 ample which shows the proximal end is represented in PI. XXXI. 

 fig. 12, and may be compared with the corresponding part of the 

 smaller rib, fig. 17, PI. XXVII. This proximal end is the speci- 

 men figured by Biinzel as the lower jaw of a lizard, a determination 

 which is presumably due to its imperfect condition and the circum- 

 stance that the transverse platform is only developed on one side. 

 I owe its identification to Mr. Hulke, who recognized its resemblance 

 to the smaller specimens when examining the collection. 



The cervical rib wants the articular head of the lower tubercle. 

 The interspace between these two heads was nearly 1^- inch, the 

 outline between them being deeply concave ; the ventral outline is 

 flat, the dorsal outline concave. The length of the rib, as preserved, 

 is Sfa inches. After being directed outward for half its length, it 

 curves concavely backward and tapers at the same time. There is 

 in front, in the middle of the rib, a slight ridge. The articular head 

 which is preserved is T 6 ^ inch long and fa inch wide. When perfect 



