324 Prof. H. G. Seeley on Euskelesaurus Brownii. 



of the early caudal vertebras that the limbs were very short 

 relatively to the allied reptiles of Europe. 



Right Dorsal Rib. 



Only one example of a dorsal rib has been collected by 

 Mr. Brown ; it is numbered 57, a, b, c. The proximal extre- 

 mity is not preserved, and it is imperfect distally. The 

 fragment is 10^ inches long ; it shows a convex curve directed 

 outward and backward, is compressed from side to side 

 towards the proximal end, where it deepens. The vertical 

 measurement, as preserved, is 3| inches, but the articular head 

 attached to the side of the centrum is lost, and the neck is 

 1^ inch deep, convex in front, a little concave behind, narrow 

 above, and nearly an inch from side to side below. The 

 facet for attachment to the transverse process, about an inch 

 from side to side, appears to have been nearly vertical, notching 

 out the superior border of the rib. External to it the bone 

 contracts in dimensions ; but as the superior surface, which is 

 at first narrow, is prolonged outward it becomes widened and 

 flattened, reaching a width of more than 1 inch at the distal 

 termination, where the bone is 1£ inch deep and subtriangular 

 in vertical section. The anterior aspect is flattened and the 

 posterior surface is marked by a groove in its upper third, 

 which originates behind the transverse process and is produced 

 parallel to the superior contour down the length of the bone. 

 This dorsal rib is relatively small, and from the other evidence 

 may be regarded as not improbably one of the last of the 

 series. The want of definition of the tubercular surface by a 

 distinct neck may be in favour of this position in the skeleton. 

 No affinities are deducible from the characters here shown. 



Early Caudal Vertebrce. 



The tail of Euskelesaurus is shown by the early vertebras 

 described by M. Fischer to have been both strong and elon- 

 gated. The centrum is about A\ inches long in most 

 vertebras. The transverse process, as preserved, only extends 

 outwards for about 3 inches. 



The neural arch is compressed from side to side above the 

 transverse processes. The zygapophyses are well developed. 

 The anterior process is directed forward and the facet looks 

 upward ; the posterior facet looks downward. The posterior 

 pair were separated by a narrow notch. The neural spine is 

 broken away. The height of the neural arch, as preserved, 

 is 4 inches ; its transverse width at the base exceeds 3 inches ; 



