PREFACE. iii 



Another benefit flows from publication ; the correction, viz. of errors into 

 which the author may have fallen. His acceptance, for example, of Mantell's and 

 Cuvier's determinations of parts of the Iguanodon as the " tympanic bone '' and 

 " clavicle " has been rectified ; in regard to the first, by the accomplished Professoi- 

 Seeley's recognition of it as part of a vertebra of another genus and species ; and, 

 in regard to the second, by Professor Leidy's reference of it to a part of the pelvis, 

 as a pubic bone. 



The more recent discovery, in a Belgian locality, of an almost entire skeleton of 

 an Iguanodon confirms these rectifications, and almost completes the restoration of 

 that truly remarkable gigantic extinct form of phytophagous Reptile.' And here 

 I cannot but gratefully notice the truly valuable additions to our knowledge of 

 Dinosaui'ian fossils made by the personal labours, enterprise, and science of 

 Professor 0. C. M.arsh, of Yale College, New Haven, Connecticut, United States. 



Such indications of the numbers of animal forms, which have existed during 

 long epochs of our earth's past histoi'y, give an impression that the labours of an 

 individual devoted to the fossil remains of a limited group can but leave a mere 

 sketch of a fragment of the class — a sketch, however, which cannot fail to be 

 filled in by the labours of successive generations of Palgeontologists. 



^ These remains were discovered, in 1881, at Bernis.'sart, and their matrix was determined bv the 

 accomplished Director of the Eoyal Museum of Natural History, Brussels, Prof. Edouaru Dupont, 

 to belong to the Wealden Series ; the fossils are referred by Prof. P. G. Van Beneden to belong to 

 the species Iffuanodon Mantelli. (' Bulletin de I'Academie Eoyale des Sciences de Belgique,' 8vo, 

 1881, p. GUO.) 



