454 J. W. HULKE Olf IGUANODON PRESTWICHII 



of the bone. In the inner metatarsal the inner condyle is narrow 

 and prominent, the outer condyle broad and low. 



Phalanges. — Of these 13 are preserved; iv. 29, 22, 39, are 

 probably the 1st, 2nd, 3rd phalanges of the inner toe of the right 

 foot ; their greater length distinguishes them from iv. 42, 43, which 

 are referable to an outer toe, the phalanges of which are distin- 

 guished for their shortness. The unguals are very strong, laterally 

 compressed, and impressed with a deep submarginal nail-groove. 



Shoulder-girdle and Fore Limh. — The only parts of the segment 

 of the skeleton which can be certainly identified are the scapulse 

 and proximal ends of the humeri. 



The ScapidcE, iii. 1, 2a, 2b, closely resemble those of "Wealden 

 Iguanodons from the Isle of Wight. The glenoid end shows the 

 usual rough sutural coracoid surface, and the smooth concave glenoid 

 part for articulation of the humerus. The coracoid part near its 

 posterior border is furrowed by a conspicuous groove, which enters it 

 from the thoracic aspect. The dorsal end of each scapula is missing, 

 so that the length of this bone is unknown. 



The fossil iii. 6 so closely resembles typical Iguanodont coracoids, 

 that its nature can scarcely be doubted. Its form is simple, as in 

 "Wealden Iguanodonts ; and, as in these, it is remarkable for its 

 relatively small size. 



'No. iii. 4 is, I have no doubt, the proximal end of the left 

 humerus. In its general form, and especially by the presence of 

 a strong process at its posterior border, it closely imitates a very 

 large humerus which I obtained several years since at Brooke Bay. 

 No part of the shafts or distal ends of the humeri can be identified ; 

 nor can I speak with certainty of the bones of the forearm. Some 

 imperfect bones, which I regard as metacarpals, are more slender, 

 and appear to have been relatively longer than the metatarsals. 

 A reconstruction of the fore foot out of these imperfect and disso- 

 ciated remains must necessarily be so conjectural that I have not 

 attempted it. 



Eor this Kimmeridgian Iguanodon, the distinctness of which 

 from the Wealden I. Mantelli is demonstrated (a) by the different 

 shape of the thoracic vertebrae, the centrum of which is wedge- 

 shaped in the Kimmeridgian Iguanodon, very constricted in the 

 Wealden Iguanodon, (b) by the flattening of the under surface of 

 the centra in the sacrum of the Kimmeridgian, which in the 

 Wealden is keeled, (c) by the smaller number of sacral centra in 

 the Kimmeridgian Iguanodon, and (d) by the relative simplicity of 

 the marginal serrature of its teeth, I propose the specific name Frest- 

 wichii — Iguanodon Frestwichii. 



