Tol. 51.] SATTROPODOUS DINOSAUR FROM MADAGASCAR. 



331 



2. — Right lateral aspect of an imper- 

 fect late cervical vertebra of Bothrio- 

 spondylus madagascariensis. {About 



3 nat. size.) 



Pis:. 2. — Riciht lateral aspect ofanimper- elongated, while the in- 

 ferior surface is rounded. 

 The lateral cavities are 

 large and rounded : their 

 outer inferior margin not 

 being raised above the 

 general level to form a 

 pocket. The narrow 

 septum between them is, 

 as in the figure, well 

 exhibited. In the figured 

 example the length is 6^, 

 and the posterior width 

 5| inches ; the corre- 

 sponding dimensions in 

 the larger example being, 

 severally, 9 and 6| inches. 

 . The specimen repre- 

 sented in fig. 2 is an 

 imperfect vertebra from 

 the hinder part of the 

 cervical region, exhibit- 

 ing the contour of the 

 entire lateral cavity. Although shorter than the anterior cervicals, 

 it is still narrow, and rounded inferiorly. The septum between the 



_. _ _ " , 7 . , 77 two lateral cavities 



iig. o. — Left lateral aspect of centrum of dorsal 



vertebra of Bothriospondylus madagascari- 



ensis 



is so thin that in 

 ' developing ' it has 

 been broken 

 through. The ca- 

 vity is irregularly 

 pear-shaped, with 

 the longer diameter 

 directed upwards 

 and backwards. 

 The lower bound- 

 ary of the lateral is 

 raised up as wall 

 for a considerable 

 distance above the 

 floor, so as to con- 

 vert the lower por- 

 tion of the cavity 

 into a pocket. The 

 length of the cen- 

 trum of this spe- 

 cimen is 6| inches, 

 and its proximal 

 width is 5f inches. 

 The dorsal vertebrae are represented by the specimen shown in fig. 3, 



