334 



ME. R, 



LYDEKKER ON BONES OF A [Aug. 1 895, 



Regarding the affinities of the gigantic dinosaur represented by 

 the above-described vertebras, the flat terminal faces of the posterior 

 caudal vertebrae indicate that it cannot be identified with titano- 

 saurus of the Cretaceous of India, England, and Patagonia. From 

 Hoplosaurus (Orniihopsis) it is at once distinguished by the narrow 

 septum between the lateral cavities of the centra, the septum of 

 the latter being of great thickness, and, like the rest of the centrum, 

 much cancellated. Moreover, there is no communication between 



Fig. 5. — Left lateral and inferior aspects of the centrum of an early 

 caudal vertebra of Bothriospondylus madagascariensis. (About 

 ■j nat. size.) 



the lateral cavities of the centrum and the interior, as is the case 

 in Hoplosaurus. Similar differences serve to distinguish the vertebrae 

 from those of Morosaurus} 



Unfortunately the dorsal vertebras of Cetiosaurus oxoniensis are 

 so badly preserved, and so imperfectly figured, that I am unable to 

 say anything regarding their lateral cavities ; and I am unac- 

 quainted with any specimens of those of Pelorosaurus. From the 

 resemblance of the other remains of these genera to those of Atlanto- 

 saurus, Brontosaurus, etc., it is, however, quite probable that at 

 least in the typical Wealden representative of the latter the ver- 

 tebras were of the Hoplosaurus-type, as are those of the American 

 genera. 



1 See Lydekker, Quart. Journ. Geol. Soc. vol. xlix. (1893) p. 277, fig. 1. 



