ON A NEW DINOSAUR FROM THE ISLE OF WIGHT. 



55 



5. On the Dorsal Region of the Vertebral Column of a new 

 Dinosaur (indicating a new Genus, Sphenospondylus), from the 

 Wealden of Brook in the Isle op Wight, preserved in the 



WOODWARDIAN MUSEUM of the UNIVERSITY of CAMBRIDGE. By 



Prof. H. G. Seeley,F.R.S., F.G.S., &c, Professor of Geography 

 in King's College, London. (Read June 21, 1882.) 



This small series of six vertebral bones is remarkable for the great 

 lateral compression of the centrum and the depressed form of the 

 neural arch, and, as exhibiting the characters of the dorsal region in 

 a new generic type, seems to me worthy of some notice. 



Fig. 1. — Dorsal Vertebra of Sphenospondylus, right side of type 

 specimen in Woodwardian Museum. (One half nat. size.) 

 tp 



b. Facet for head of rib. 



ty. Transverse process. 



The centrums of the vertebras have an average length of 9 cen- 

 tim. each ; the transverse width of the articular faces is about 7 cen- 

 tim., with a vertical depth of at least 8 centim. ; but the lower part 

 of the centrum is much compressed from side to side, so as to have a 

 wedge form, and terminates inferiorly in a sharp longitudinal ridge. 

 The articular margins of the centrums are moderately elevated. The 

 transverse processes of the neural arch are at first directed back- 



