INCERTJE SEDIS. 153 



which this genus was founded might belong to a member of the 

 present Suborder ; it indicates a comparatively large form. (See 

 Coelurus daviesi. p. 156.) 



Thecospondylus horneri, Seeley \ 



Hab. Europe (England). 



R. 291. A specimen described in the first notice as a natural cast of 

 {Fig.) the neural canal of the sacrum ; from the Hastings Sand 

 (Lower Wealden) of Southborough, Kent. The type spe- 

 cimen. Figured by Seeley in the ' Quart. Journ. Geol. 

 Soc' vol. xxxviii. pi. xix. ; and noticed in vol. xliv. p. 79, 

 where it is regarded as a mould of the entire sacrum. 

 Small fragments of bone remain in places. 



Presented by Dr. A. C. Homer, 1882. 



Genus MACRUROSAURUS, 



This genus may belong to the present or next Suborder, and is 

 known only by caudal vertebrae, which are much elongated in the 

 postmedian region, have no distinct postzygapophyses, and in the 

 anterior and medial part of the series are proccelous ; the entire 

 length of the tail is estimated at 15 feet. It is suggested by the 

 founder of the genus that the metapodium to which the name 

 AcanihopJiolis platypus 2, has been applied may belong to the present 

 form ; that metapodium is of a Sauropodous type. 



Macrurosaurus semnus, Seeley 4 . 

 The type species. 

 Hab. Europe (England). 



35252. The centrum and part of the arch of a postmedian caudal 



vertebra ; from the Cambridge Green sand. 



Purchased, 1859. 



35253. A very similar specimen ; from Cambridge. Same history. 



35338. The centrum and greater part of the arch of a somewhat 

 smaller caudal vertebra ; from Cambridge. Same history. 



35389. The centrum of a considerably smaller posterior caudal 

 vertebra ; from Cambridge. Same history. 



1 Quart. Journ. Geol. Soc. vol. xxxviii. p. 457 (1882). 



2 Ibid. vol. xxxii. p. 440 (1876). 



3 Seeley, Ann. Mag. Nat. Hist. ser. 4, vol. viii. p. 305, pi. vii. (1871). 



4 Quart. Journ. Geol. Soc. vol. xxxii. p. 400 (1876). 



