600 BRITISH FOSSIL REPTILES. 



have not ' distinct capitula and tubercula,' have no ' capitular portions, or transverse pro- 

 cesses;' in fewer words, no parapophyses. 



In reference to Professor Huxley's " Character No. 3," I submit that a Saurian with 

 sacral vertebrae reduced to two in number is not a Dinosaurian. 



" 3. The chevron bones are attached intervertebrally and their rami are united at 

 their vertebral ends by a bar of bone."* This is a character of Iguanodon\ and of 

 SccUdosaurus,X but not of Cetiosaurus\ nor of Omosaurus,\\ " Char. 3 " is one of a genus, 

 not of the Order Dinosauria. 



" 5. The skull is modelled upon the Lacertian, not on the Crocodilian type." For 

 the instances in which the Dinosaurian skull departs from the Lacertian, and approxi- 

 mates to the Crocodilian type, I refer to pp. 520 — 530, and ' Dinosauria (Pis. 50, GO), 

 These instances confirm and add to the combination of Crocodilian with Lacertian 

 characters, propounded, in 1841, as exemplifying the more generalised Saurian type of the 

 extinct order Dinosauria. 



"6. The teeth are not anchylosed to the jaws, and may be lodged in distinct sockets." 

 They become anchylosed in Hylceosaurus, and the manifold modifications of the dental 

 system in Dinosauria concur with those of the skull and jaws themselves in exemplifying 

 the mixed or more generalised character of the group. •[ 



" 7. There is no clavicle." This is probable from the crocodilian affinities shown in 

 the skull and vertebrte ; and the character founded on the bone, so called, in my early 

 diagnosis of Dinosauria, must be suppressed : but I have not yet seen a specimen of a 

 Dinosaur in which the scapular arch was shown in its natural condition and integrity. 



Before continuing my remarks on some ofthe Professor's remaining twelve characters of 

 Dinosauria, I would observe, in reference to comments upon the step taken of substituting 

 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 oi 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 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. 



* Ibid., vol. xxvi, p. 33. 



t Monogr. ' Wealden Reptilia,' part ii, Pal. vol. for lSr.4, p. 15, t. viii. {Iguanodon Matitelli) 

 ib. ib., t. i, Iguanodon Foxii (if this be not an immature specimen). 



J Monogr. 'Fossil Dinosaur ofthe Lias,' Pal. vol. for 1860, p. 8, t. vii. 



§ PhiUips, ' Geol. of Oxford,' p. 259, fig. 2, 8vo, 1871. 



II Ante, p. 55, pi. xvi. 



11 'Odontography,' pp. 246—254, 269—2/2, pis. 62a, 70, 70a, 1840. 



