10 Br. R. Woodward — On Iguanodon Mantelll. 



Aug. 19, 1868. Geol. Mag. Vol. V. pp. 469-480; and Kept. Brit. Assoc. 



for 1868, Trans, of Sections, pp. 51-58. 

 1870. — 37. The Devonian Group considered Geologically and Geographically. 



Eept. Brit. Assoc, for 1869, Trans, of Sections, pp. 88-90. 

 1873.— 38. Address to the Geological Section of the British Association, Brighton. 



Eept. Brit. Assoc, for 1872, Trans, of Sections, pp. 90-96. (Also printed 



in Nature, August 29th, 1872.) 

 1877. — 39. On the Geological Signilicance of the Boring at Messrs. Meux's Brewery, 



London. Geol. Mag. Dec. II. Vol. IV. pp. 474-475. 

 1877.— 40. On some further Evidence as to the Range of the Palseozoic Rocks 



beneath the South-East of England. Eept. Brit. Assoc, for 1877 (Coiouied 



Geological Map). 



II. — Iguanodon Mantelli, Meyer.^ 



By Henkt Woodward, LL.D., F.R.S, 



^PLATE I.) 



IN 1822, just sixty-three years ago, Mrs. Mantell found the first 

 tooth of a new and remarkable reptile (afterwards known as 

 Iguanodon) , imbedded in a mass of coarse conglomerate, which had 

 been brought as ' road-metal ' from one of the quarries in the 

 Wealden formation of Tilgate Forest. 



This tooth, with others subsequently found in the same rock, was 

 submitted to Baron Cuvier, who pronounced them to belong to a 

 large terrestrial herbivorous reptile hitherto quite unknown. 



Various other detached and fragmentary remains were subse- 

 quently collected in the Wealden strata, and in 1825 the discovery 

 M^as communicated by Dr. Mantell to the Eoyal Society,^ when the 

 name of Iguanodon was proposed for the fossil reptile, from the 

 resemblance which its teeth presented to those of the living Iguana, 

 a large vegetable-feeding lizard common in the "West Indies and 

 Central America. 



In 1834: the first important connected series of bones of Iguanodon 

 was discovered by Mr. W. H. Bensted in the "Kentish Eag " 

 quarries of the Lower Greensand formation at Maidstone. 



This specimen (which is preserved in the Geological Gallery of 

 the British Museum of Natural History) consists of a large number 

 of the bones of the skeleton of a young individual imbedded in stone 

 in a very confused manner and all more or less flattened and dis- 

 torted. Amongst them are two long and very slender bones which 

 in the original description are referred to as " two clavicles," and 

 they continued to be so called in Owen's British Fossil Eeptiles.^ 



The true nature of these long and slender bones was pointed out 

 by Prof. Huxley in a paper entitled "Further Evidence of the 

 Affinity between the Diuosaurian Eeptiles and Birds."'* They are 

 in fact the ischia, and occupy in Bensted's Iguanodon a position 

 near to the ilium, to which they were once united. 



Another specimen, embracing the chief part of the vertebral column 

 with some of the bones of the extremities of a supposed young Igua- 



' " PaliBologica," by Hermann von Meyer, 1832, 8vo. (Frankfort). 



2 See Phil. Trans, vol. 115, p. 179. 



3 Pal. Soc. 1851, pp. 111-113, tab. xxxiv. 



* Quart. Journ Geol. Soc. 1869, vol. xxvi. pp. 12-50. 



