SUPPLEMENT. 257 



vol. xlv. of the same serial. The inner trochanter and 

 the outer condyle are broken away. 



Made in the Museum, 1888. 



R. 1617. An imperfect dorsal vertebra which would agree in rela- 

 tive size with the type, and may be referable to the present 

 form ; from the Oxford Clay of Weymouth. This speci- 

 men, which has been bisected in a vertical longitudinal 

 plane, shows the centrum and the base of the neural 

 canal. The length of the former is 0,061 (2*4 inches), and 

 its transverse diameter 0,051 (2 inches). It has some- 

 what the same degree of lateral compression as in the 

 dorsals of Iguanodon dawsoni, and the neural canal is of 

 the low type characteristic of the Iguanodontidce as dis- 

 tinguished from the Scelidosauridce. 



Presented by R. LydehJcer, Esq., 1889. 



Genus CAMPTOSAURUS, Marsh \ 



Syn. Camptonotus, Marsh 2 . 



Including Cumnoria, Seeley {supra, i. p. 195). 



Teeth simpler than in the typical group of Iguanodon. Cervical 

 vertebrae opisthocoelous ; sacrals flattened inferiorly and not anchy- 

 losed. Manus with five normal digits. Ilium (supra, i. p. 192, 

 fig. 35) typically deep, with short and pointed pre- and postacetabu- 

 lar processes, the latter having a distinct ventral plate ; pubis rela- 

 tively stout, and as long as ischium. Femur slightly longer than 

 tibia, with curved shaft and pendent inner trochanter; typically 

 four functional digits in pes. 



The following forms are provisionally referred to this genus, their 

 small size distinguishing them from all known members of the Pro- 

 iguanodont group of Iguanodon. 



Camptosaurus valdensis, Lydekker 3 . 



Of the approximate size of C. leedsi, but doubtless, on account of 

 its higher geological horizon, specifically distinct. 



Hab. Europe (England). 



Type, the femur No. R. 167, supra, i. p. 195. 



The mandibular ramus, No. 180, supra, i. p. 227, is provisionally 

 referred to this species. 



1 Airier. Journ. ser. 3, vol. xxix. p. 169 (1885). 



2 Ibid. vol. xviii. p. 501 (1879). — Preoccupied by Uhl for a genus of Ortho- 

 pterous Insects in 1864. 



3 Quart. Journ. Geol. Soc. vol. xlv. p. 48 (1889). 



PART IV. S 



