﻿74 FOSSIL REPTILIA OF THE 



that name of the Order for one of a Family which, for reasons above given, could not have- 

 stood in Taxonomy, that the further insight into the structure of Mammalia tersely expressed 

 in the names and characters of the Orders in the ' Regne Animal ' was gratefully accepted 

 by all single-minded cultivators of Biology, although some of such orders were the 

 same or nearly the same as those defined and otherwise named in the ' Systema Naturae/ 

 Cuvier was not deterred from fixing this additional step in the advance of Zoology by 

 the opportunity it might open to an objector for charging him with unfairness or 

 injustice to Linnaeus ; nor was Linnaeus much moved by like remarks to which he was 

 subjected by the critics of that era in reference to his names for groups of plants more 

 or less similarly defined, before him, by John Ray, and others. 



To return, however, to my proper task, more especially in reference to the affinities of 

 the Dinosauria. 



The first clue to the homology of the supposed clavicular bone of the Iguanodon 1 was 

 given by Professor Leidy in the ' Proceedings of the Academy of Natural Sciences of 

 Philadelphia,' December ]4th, 1858. In the description there given of the fossil remains 

 of a Reptile, which he calls c Hadrosaurus,' from the marl of New Jersey, which marl, 

 from the affinity of this Reptile to the Iguanodon, he surmises may be of the Wealden or 

 Green-sand period, Leidy finds, with the ilium, "a bone which I suspect to be the 

 pubic, but which appears to correspond with that of the Maidstone Iguanodon, described 

 as the clavicle" (p. 9). In a subsequent illustrated Monograph, 2 Leidy repeats 

 his homology of the bone in question and notes — " an ilium and a supposed pubic 

 bone, imperfect" (p. 71). Of the latter a figure is given (" PI. VIII, fig. 13 "), and Un- 

 accomplished Author truly remarks : — " It bears a general resemblance to that indicated by 

 Professor Owen and Dr. Mantell as the clavicle of the Iguanodon ; but appears to me 

 rather to resemble the pubic bone of the Iguana and Cyclura than the clavicle of the- 

 same animals." 3 



Professor E. D. Cope, Corr. Sec. Academy of the Nat. Sciences, Philadelphia, commu- 

 nicated to the Academy, in 1867, a paper " On the Extinct Reptiles which approached 

 the Birds," of which an ' Abstract' was given in the ' Proceedings of the Academy ' for 

 December of that year. In this 'Abstract' the Professor is reported as stating that " he 

 was satisfied that the so-called clavicles of Iguanodon and other Dinosauria were pubes, 

 having a position similar to those of Crocodilia." 4 There is no reference, therein, to 

 Professor Leidy, nor to the paper by Professor Huxley " On the Classification of Birds " 

 which was published in the ' Proceedings of the Zoological Society,' 1867, p. 41 5. 6 



1 'Philos. Trans.,' p. 138, 1841. 



2 'Cretaceous Eeptiles of the United States,' p. 97, pi. viii, fig. 13 : in the 'Smithsonian Contribu- 

 tions to Knowledge,' No. 192, vol. xiv, 4to, 1865. 



3 Op. cit., p. 97. 



4 'Proceedings of the Academy of Natural Sciences of Philadelphia,' p. 234, 8vo, 1867. 



5 See "Note," p. 24, in 'Quarterly Journal of the Geological Society of London,' vol. xxvi (1870). 



