Dinosauria Iguanodon and Orthomeruts. 



23 



Remains of other species are exhibited in Wall-case 4a. 



Numerous foofc-prints of these animals have been found in 

 the Wealden deposits of Hastings, and are exhibited in Gallery 

 No. 11, Wall-case No. 8. 



In all cases only the impressions of the hind-foot are seen, 

 so that there can be little doubt that the mounted skeleton 

 correctly represents the position of the reptile when walking. 



The Iguanodon was vegetarian in its diet, as is proved Ig-uanodon. 

 by its teeth, which correspond with those of the living and Wall-cases, 

 vegetable-feeding Iguana of S. America. Nos. 4a, 5, 



Their teeth are not unfrequently found worn down at the 

 crown, like the molar teeth of the herbivorous mammalia at the 

 present day. They were implanted in partially distinct sockets, 

 and a succession of teeth always growing up from beneath 

 replaced the worn-down stumps. The teeth are curved and 

 leaf-shaped, and the edges are elegantly serrated, a character 

 peculiar to all the vegetable - feeding Dinosaurs, such as 

 Acanthopholis, Scelidosaurus, &c. (see Figs. 24 and 26). 



and 6. 



Table-case, 

 No. 15. 



FIG. 27. Left lateral aspect of skull of Iguanodon Bernissartensis (Boulenger) ; from the 

 Wealden of Beraissart, Belgium (much reduced). The anterior aperture in the skull 

 is the nares (nostril), the middle one the orbit, and the large posterior one, the lateral 

 temporal fossa. The predentary bone is seen at the extremity of the mandible 

 (after Dollo). 



The genus Orthomerus (Seeley), an Iguanodont, and a species Table-case, 

 of Megalosaurus, from the Upper Chalk of Maestricht, appear, so No 'l 15 ' 

 far as yet known, to be the most recent, and probably the last 

 representatives in Europe in geological time of the great group 

 of terrestrial Dinosaurs. Both species are founded upon a few 

 long bones of limbs in the collection, and assuming them to 

 have belonged to fully adult animals, their small proportions, 

 when compared with those of their predecessors, probably 

 indicates degeneration in an expiring race. 



