142 PETRIFACTIONS AND THEIR TEACHINGS. CHAP. III. 



Below this fossil are several ribs, and a portion of a remark- 

 ably fine rib, thirty-six inches long. 



A perfect Clavicle, (figured in " Geology of the South-East 

 of England," PI. IV.), and portions of others. 



There are chevron bones, and many detached vertebrae on 

 the shelf to the left of the central specimen ; chiefly caudal 

 of the Iguanodon : but there are a few belonging to other 

 genera, as Megalosaurus, Poikilopleuron (?), Goniopholis, &c. 



Tympanic bones. On the right hand is one very large and 

 fine specimen, (figured in " Geology S. E. of England," PI. XL 

 fig. 5.). 



Humerus. A model; the original is in the possession of 

 Mr. Fowlestone, of Hyde, Isle of Wight. It afforded the 

 data by which I was enabled to determine the character of 

 this part of the skeleton of the Tguanodon. 



In the same compartment there are casts of a metatarsal or 

 metacarpal, and two phalangeal bones of Iguanodon, from the 

 Wealden of Sussex, presented by S. H. Beckles, Esq. of 

 Hastings. 



Pelorosaurus. The four splendid plano-concave vertebrae 

 placed together, with a chevron bone hanging near them, do 

 not belong to the Iguanodon, but are referred, provisionally, 

 to a colossal reptile of the Crocodilian type, named by the 

 Author Pelorosaurus Conybeari ; (figured and described in 

 " Phil. Trans." 1850, PI. XXII.) They are the Cetiosaurus 

 brevis, of "Brit. Assoc. Report," 1841. Some of the other 

 large vertebrae of this type probably belong to the same 

 genus, and other biconcave vertebrae to the genus Cetio- 

 saurus. 



There are two imperfect convexo-concave cervical vertebrae, 

 which have been referred to a species of Streptospondylus, 

 (see "Brit. Foss. Kept." p. 92), but probably belong to the 

 Iguanodon or Megalosaurus. 



Megalosaurus. There are femora, phalangeal bones, and 

 many teeth of this Reptile, from the Wealden of Tilgate Forest ; 

 and portions, (three anchylosed vertebrae,) of the sacrum, from 

 the Oolite of Stonesfield. 



There is also the cast of a metatarsal or metacarpal bone of 

 the Megalosaurus, from the original in Dr. Buckland's posses- 

 sion, and which was given me by that eminent palaeontologist : 

 it serves to illustrate the homologous bone in the Iguanodon. 



