SUPPLEMENT. 237 



Morosaurus brevis (Owen). 



Syn. Cetiosaurus brevis, Owen {supra, i. p. 139). 

 Pelorosaurus becklesi, Mantell l . 

 Bothriospondijlus elongatus, Owen (supra, i. p. 142). 

 Morosaurus becklesi, Marsh 2 . 



As already noticed by the writer 3 there is no evidence to show 

 that the limb -bones on which P. becklesi was founded, together with 

 the dorsal vertebra described as Bothriospondijlus elongatus, are not 

 referable to the present form, which was founded upon the evidence 

 of caudal vertebrae. The whole are therefore provisionally regarded 

 as belonging to a single species. If rightly associated the humerus 

 will be shorter in proportion to the vertebrae than in the typical 

 American species. The ilium No. 2576 (supra, i. p. 143) presents 

 all the characters of that of Morosaurus and probably also belongs 

 to the same form. 



Genus PLEUROCCELUS, Marsh \ 



Represented by small forms, which are characterized by the 

 crowns of the teeth being less spoon-shaped and more like compressed 

 cones than those of Morosaurus ; and the elongation of the centra of 

 the cervical and dorsal vertebrae (fig. 52), the latter having a very 

 long and deep lateral cavity gradually shelving upwards towards the 

 neural arch, and with the opisthoccelous character very strongly 

 marked. 



Pleurocoelus valdensis, Lydekker 5 . 



Typified by teeth (fig. 51), which from their small size and 

 contour are provisionally referred to this genus. The undermen- 

 tioned vertebrae approximate to those of the typical species. 



Possibly this type of tooth may indicate more than one species. 



To this species belong the teeth entered in Part I. p. 185 under 

 the heading of Hylceosaurus. 



Hab. Europe (England). 



1 Proc. E. Inst. vol. i. p. 153 (1852). — No description. 



2 Amer. Journ. ser. 3, vol. xxxvii. p. 325 (1889). 



3 Nicholson & Lydekker, 'Manual of Paleontology/ 3rd ed. vol. ii. p. 1179 

 (1889). 



4 Amer. Journ. ser. 3, vol. xxxv. p. 90 (1888). 



5 Geol. Mag. dec. iii. vol. vi. p. 325 (1889). 



