WEALDEN IGT7AN0D0NT AND OTHER DINOSAURS. 59 



same authority as Dinosaurian, and named Dinodocus Makesoni *, 

 may possibly belong to this genus. 



The limb-bones of the Indian species of Titanosaurus are of the 

 solid Sauropodous type, and since the caudal vertebrae of the type 

 species agree with those of Cefiosaurus in the absence of distinct 

 postzygapophyses, and in having open chevrons articulating by 

 double facets, I am disposed to revert to my original view of re- 

 garding Titmiosaurus as nearly allied to Getiosaurus. 



With respect to the above-mentioned dorsal vertebra from Cuck- 

 field (B.M. No. 2239), figured by Sir R. Owen as the quadrate of 

 an Iguanodon, then made one of the types of Ornitliopsis by the 

 founder of that genus, and subsequently figured by the former 

 writer under the name of Bothriosjpondylus magnus, I am very 

 undecided as to its affinities. It is certainly specifically distinct 

 from the Isle-of- Wight Ornithopsis, and the relatively narrower 

 centrum induces me to regard it as in all probability likewise 

 generically difi'erent. Although of rather smaller dimensions, it 

 appears to approximate to the imperfect dorsal vertebra from Sussex, 

 which I have mentioned under the head of Getiosaurus brevis, and 

 it may perhaps have belonged to a smaller individual of that species, 

 although there is no reason against its being referable either to 

 Titanosaurus or to the same form as that to which the above-men- 

 tioned casts of limb-bones pertained, if such form be distinct from 

 both G. brevis and Titanosaurus. Pinally, there appears to be no 

 possibility of arriving at any conclusion as to the identity with, or 

 distinctness from, any of the above-mentioned forms of the genus 

 Thecospondylus t founded upon the natural cast of part of a sacrum, 

 which is regarded by its describer as not improbably belonging to 

 the present group. 



Theropoda. — In respect of this suborder, the remarks that I have 

 to make are very brief. First, I find that the vertebrae from the 

 Kimeridge Clay, on which Sir R. Owen founded the genus Bothrio- 

 spondylus^ appear to indicate a Dinosaur, closely allied to the genus 

 Greosaurus, described by Prof. Marsh from the Upper Jurassic of 

 North America, which is included by its founder in the Megalo- 

 sauridae ; and it may therefore be a question whether some of the 

 teeth hitherto referred to Megalosaurus may not belong to the 

 former genus. In regard to Megalosaurus itself, some of the teeth 

 from the Wealden agree with the tooth from the corresponding 

 formation of Germany, recently figured by Dr. Koken t under the 

 name of ill. Dunkeri, in showing no trace of serrations on the 

 anterior border of the crown. A large series of specimens shows, 

 however, that this feature is due to abrasion, and a complete transi- 

 tion is observable from teeth with well-marked, though small, 

 serrations to those in which they have completely disappeared. The 

 small size of the serrations and their tendency to early disappear- 

 ance seems, however, to be a good specific character distinctive of 



* History of British Fossil Eeptilia. List of woodcuts, 



t Quart. Journ. Greol. Soc. toI. xxxviii. p. 457 (1882). 



I Palgeontologische Abbandlungen, toI. iii. p. 316, pi. xxxi. fig. 2 (1887). 



