1870. | HULKE—-WEALDEN VERTEBRA, 323 
rity to mine. Unfortunately the comparison cannot be extended to 
their form, since my arch &c. wants nearly the entire centrum, and 
the British Museum centrum bears only a very worn and mutilated 
upper structure. Their identity must therefore be left at present 
undetermined *. 
Two of the leading features in the frame of this new vertebra, 
the median wedge and notch (accessory to the ordinary articulating 
surfaces of the zygapophyses), and the broad platform, point in the 
direction of Dinosauria. ‘The wedge and notch (similar in principle, 
but differently placed to the zygosphene and zygantrum of Snakes), 
which, till very lately, I believed to be peculiar to this vertebra, are 
present also, Prof. Huxley tells me, in Megalosaurus; and the plat- 
form upon the neural arch is one of the marks of Jguanodon 
Mantellr. 
Dunensions. 
inches 
Neurapophyses, length (from front to back) about.......... 3) 
93 height to top of neural canal, about ........ 5 
is s CLOW Me OLFANCIIS ae uAy en eno eiien Alia 6 
Prezygapophyses. Upper articulating surface. 
Transverse diameter (or from median to outer border) .. 32 
ANTMIESTRO DOS HSIAO GME NOTHWETS) o's) bAsin isc Gi Ales mietcl alle iol 1-9 
Interpreezygapophysial notch. 
(Aintero=posterion)lenotheina Ger seis ae lak oe ee 2 
VAY AkanelaL PoeloauaVals Grete, Bicho aslo cso Ge Res One coh A en cee Re MEME 7 
toy’) TRAE AURGYALIBS get gla act n: Rellie ene, ice ac eee ls un 11983 
Vertical wedge beneath the postzygapophyses. 
Rlerine alle pth mercies weaned n/a celeb tie eae ois 2 
SUSI GETOUSSS” a oat. We enelied ste i) SUS: Sie Ai eR ange Pe off) 
Transverse process. 
Memeathwalone, Upper SUELACE a ).)2)4 05 se oe ee ols ane ole 35 
Costal articulating surface, vertical diameter .......... 2°5 
Hllorciosaienle CAINE LER isa) en oho am fie icon See sope) oe hed 
Heconmu(oroader tham)y (sss. oi tele; did asics @ oilers fi iso) 5 
Meiualespime (Goillars)) lensthiys)) Salieias de sergses alate gee if 
* Should it hereafter be established, there will still be the question, What is 
this S¢reptospondylus? The vertebra is in the North Gallery. It bears the Cata- 
logue number 28632, and also a written label with the words “ Wealden, S.E. 
England ;” and it formed part of the Mantellian collection. It differs from all 
the other opisthocelian vertebrz in the National Collection, not merely in its 
texture, but also in its form and proportions, and more particularly in the 
presence of a very large and deep excavation in the side of the centrum, nearly 
perforating it, beneath the neural canal. In position, this pit corresponds, as 
Mr. Seeley has lately pointed out, to the pneumatic foramen of the Pterodac- 
tylian vertebra. But should any one be tempted to conjecture, from the 
presence of this pit, together with the very open texture of the bone, that this 
Streptospondylus was an enormous flying Saurian, he will do well to bear in mind 
that an extremely light skeleton does not necessarily prove endowment with 
flight, and also that all Pterosaurian vertebra yet known are proccelian, and what 
perhaps is of minor importance, that the horizontal diameter of their articular 
