NO. 16fi6. OSTEOLOGY OF CAMPTOSAURUS—GILMORE. 289 



different t_ype of the parallel ridging and coarser serration of the 

 teeth. The vertebra^ are relatively Avider, the neural arch and cen- 

 trum both being more depressed; the lamina of the neural arch are 

 very stout, and the neural canal very small ; the sacral vertebra? are 

 not ankylosed, are only four in number, and are convex on the ven- 

 tral surface. The early caudal vertebrae are reduced in length, and 

 have the neural arch small. The astragulus and calcaneum are 

 separate." 



In 1899, Lydekker referred the species to Camptosaurus, thus rele- 

 gating Ctminoria "" to the rank of a synonym till it can be shown to 

 have well-marked distinctive features." He further says : " Evi- 

 dence of affinity between that species [Cumnoria {I gaanodon) prest- 

 u'lchii] and Camptosaurus is shown by the angulated and flattened 

 hsemal surface of the sacral vertebrae, and by the absence of ankylosis 

 between the centra." 



Hulke believed the typical specimen to represent an animal be- 

 tween 10 and 12 feet in length, but not fully adult. 



While the foregoing review of the description and figures of 

 C. presfivichii, as compared with the homologous parts of the Ameri- 

 can species, show many points of resemblance, certain differences 

 which have been pointed out show a closer relationship to Iguanodon 

 than to Camptosaurus. The acquisition of better-preserved specimens 

 may eventually show the generic distinctness of this form; but at 

 the present time I fail to detect characters of sufficient importance to 

 warrant its separation. For the present, C. prestwichii may be dis- 

 tinguished as follows: 



Speci'fic characters. — Typically of moderate size; centra of cervical 

 vertehrcB suhrhomhic in outline. Sacrum of four vertehrm without 

 peg-and-notch articidation. Femur with deep., narrow., intercondylar 

 notch. Unguals of pes compressed laterally. Metacarpals slender 

 and relatively longer than metatarsals. 



CAMPTOSAURUS? LEEDSI Lydekker. 



Camptosaurus Icedsl Lydekker, Quart. Journ. Geol. Soc. London, XLV, 



1889, pp. 46^8, fig. 3. 

 Camptosaurus leedsi Nopcsa, Foldtani Kozlony, Budapest, XXXI, 1901, 



p. 210. 



Holotype. — A fairly complete femur from the left side, now pre- 

 served in the collection of Mr. A. N. Leeds, of Eyebury, England. 

 From the Oxford Clay, near Peterborough, England. 



Description. — No characters of specific importance were given by 

 Lydekker to separate this species from the other forms under this 

 genus. For the present I can do no better than to quote Mr. Lydek- 

 ker's original comments. 



The present middle portion of the shaft has been considerably crushed and 

 broken, but both extremities are entire. The shaft agrees with the femur of 

 Proc. N, M. vol. xxxvi— 09 19 



