SUPPLEMENT. 239 



pt. 2, pi. ix. figs. 1, 1 a. In its elongated form, deep pos- 

 terior cup, and large upwardly-shelving lateral cavity, 

 it resembles the dorsal of the typical P. nanus (fig. 52). 

 The length when entire was approximately 0,076 (3 inches) 

 against 0,097 (3*8 inches) in the latter. The smooth 

 outer surface of the bone is in marked contrast to the 

 roughness found in the extremely young vertebras de- 

 scribed as Bothriospondylus suffosus (see p. 243). 



Mantell Collection. 



R. 1730. An imperfect adult vertebra probably belonging to the 

 same form as the preceding, or one closely allied thereto ; 

 from the Wealden of Brook, Isle of Wight. Described 

 and figured by the writer, op. cit. pi. ix. figs. 2, 2 a. The 

 lower half of the centrum is wanting, the terminal sur- 

 faces are imperfect, and the outer lamina of bone is more 

 or less completely gone from the upper part of the lateral 

 surfaces of the centrum, by which the contour of the upper 

 half of the lateral cavity is wanting. The fracture of the 

 centrum extends through the central pit of the lateral 

 cavity. When entire the length of the centrum was some 

 4 inches. Presented by the Dorsetshire Museum, 1889. 



The following specimen may belong either to the present 

 or the next family . 



R. 1621. The distal extremity of a right femur ; from the Wealden, 

 probably of Brook, Isle of Wight. This specimen, which 

 has been somewhat flattened by crushing, presents the 

 general characters of the femur of Atlantosaurus, but is of 

 considerably smaller size. In its colour and mineral 

 condition it is similar to No. 36559 (supra, i. p. 139). 



Baber Collection. Purchased, 1889. 



Family ATLANTOSAURIDiE {supra, i. p. 143). 



This family name is provisional. It has been stated that the 

 undermentioned forms are "not referable to this family, but this 

 was probably due to a misconception of the nature of the pelvis. 



Genus PELOROSAURUS (supra, i. p. 145). 



Syn. Neosodon, De La Moussaye l . 



(?) Gigantosaurus (supra, i. p. 140). 



1 Bull. Soc. Geol. France, scr. o, vol. xiii. p. 51 (1885). 



