288 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxvi. 



The anterior caudal vertebrae, as described, show the same short- 

 ness of centrum, the backward slant of the spinous process, the trans- 

 verse processes, and the distinctive obliquity of the more anterior 

 ones. As in the American species, the suppression of the transverse 

 processes is soon followed by the disappearance of the neur6-central 

 suture. The median caudals are compressed and the more distal 

 ones have a simple, cylindrical form. 



The change in form of the articular surfaces of the vertebral 

 centra, traceable through the column, when compared with the Amer- 

 ican species, is highly instructive. In the neck these surfaces are 

 opisthocoelous ; at the root of the neck, the anterior ball is less con- 

 vex, the posterior cup less deep; in the forward dorsal region, the 

 anterior surface is very slightly concave, the posterior surface more 

 so, and in the tail, both surfaces are concave. 



Such parts of the ilia as are preserved apparently lack the hori- 

 zontal j)late developed in all of the American species. Its absence, 

 however, may be due to the mutilated condition of the bones. The 

 pubis and ischium were too fragmentary for description. 



The femora were represented by portions of the articular ends. 

 The presence of a deep, narrow, anterior intercondylar notch char- 

 acteristic of the Wealden iguanodonts, is quite different from the 

 broad, comparatively shallow groove found on the femora of Camp- 

 tosaurus. The tibia', which are also imperfect, show no important 

 differences. 



The tarsus consists of two elements, astragulus and calcaneum, 

 which, as in the American species, remain distinct, and appear quite 

 similar in nearly all respects. There were no elements found which 

 could be identified as pertaining to the distal row of the tarsus. 



As described, the foot elements show no particular differences from 

 the American species, except in the lateral compression of the un- 

 guals, those of the American species, with the exception of the first, 

 being somewhat depressed. 



Some imperfect bones, which were more slender and appeared to 

 have been relatively longer than the metatarsals, Hulke regarded as 

 metacarpals. These are suggestive of an iguanodont rather than a 

 camptosaurian type of animal. 



The other elements preserved are all too fragmentary to admit of 

 comparison. 



The specimen, as briefly reviewed above, was first described by 

 Hulke as a new species of Ir/unnodon, being separated from its nearest 

 ally, /. manteUi, by the following characters: " The flattening of the 

 undersurface of the sacral centra, and the relative simplicity of the 

 marginal serrature of its teeth.'" Later, Seeley proposed the genus 

 Cvmnoria for the reception of this fossil, characterizing it as follows: 

 " It is separated from Iguanodon by many characters, such as the 



