594 



BRITISH FOSSIL REPTILES. 



Fig. 11. 



Dinosaur from the Dorsetshire Lias {Scelidosaurus Ilarrisonii, Ow.), now in the British 

 Museum. 



The broad subquadrate coracoid, with rounded angles, of the Cetiosaurus lont/us from 



the Enslovv quarries (fig. 9) repeats the characters of that 

 bone in the type of the species (• Report,' p. 102). In the 

 Oxford giant the bone measures " from the glenoid cavity to 

 the extremity near the scapular margin (incomplete) 18 

 inches ; if complete, probably 20 ; breadth between scapular 

 and sternal margins, 18"5 inches; greatest thickness 5"0." 

 (Phillips, op. cit., pp. 270, 271.) 



The scapula of Cetiosaurus resembles that in Scelido- 

 saurus, with rather less concavity of the anterior border, and 

 rather more concavity of the posterior one. It surpasses the 

 humerus in length in a minor degree than in Scelidosaurus, 

 and in a still less degree than in Iguanodon. 



In the characters of the dermo-skeleton Cetiosaurus would 

 seem not to agree with Scelidosaurus. It is very impro- 

 bable, if there had been such agreement, that not any skin- 

 scutes or spines should be shown in connection with the 

 large proportion of the skeleton of one and the same indi- 

 vidual brought to light on the excavated oolite of Enslow 

 Rocks at Kirtlington.* 



The same negative evidence in all the various finds of 

 fossil remains on which the genus was based suggested, in 

 1841, the idea that the tegument of Cetiosaurus might be smooth, or unarmed, as in 

 Ceiacea and Enaliosauria . But, as has been shown in antecedent contributions to the 

 ' History of British Eossil Reptiles,' a new interest will attach itself to the future occur- 

 rence of an osseous spine, seemingly dermal, in contiguity with the parts of the fore-limb 

 which were wanting, or not discovered, in the Kirtlington example of Cetiosaurus loiigus. 

 In Scelidosaurus the number of vertebrae between the skull and sacrum is twenty- 

 three or twenty-four ; in Iguanodon the same region includes ^more than seventeen 

 vertebrae : in this genus there are five sacral vertebrae : in Scelidosaurus four. In no 

 Dinosaur has the number of caudal vertebrae been so satisfactorily or approximately 

 demonstrated as in Scelidosaurus. Thirty-five of these vertebrae were obtained in con- 

 secutive articular association in the individual fossil skeleton in the British jMuseum. 

 If we allow the Cetiosaur, on this analogy, twenty-four vertebrae between the skull and 

 sacrum, averaging 5 inches each in length, and add an inch for the intervertebral con- 

 nective tissues, we get a total length of trunk at 12 feet. Four sacral vertebrae would 

 add two feet. Taking the number of the caudal vertebrae at that shown m Scelidosaurus, 



Caudal vertebra, Cetiosaurus lottgus, 

 Jjth iiat.size. (Phps.,lxxxix,p.259.) 



* Phillips, op. cit., diagr. l.x-xxiv, p. 2.t0. 



