DINOSAURIA OF THE CAMBRIDGE GREENSAND. 591 
46. On the Dinosavria of the CamBripce GREENSAND. By Professor 
H. G. Sentry, F.R.S., F.G.S. (Read December 18, 1878.) 
[Puates XXXIV., XXXYV.] 
Intropuctory Norte. 
THE remains of Dinosaurs were for many years very rarely met with 
in the Cambridge Upper Greensand ; and several important parts of 
the skeleton have never yet been found. But a considerable collec- 
tion of more than 500 bones is now preserved in the Woodwardian 
Museum alone; and since the greater number of these fossils have 
been discovered in larger or smaller sets of naturally associated 
remains, each of which is obviously a portion of the skeleton of a single 
individual, they afford evidence on which it is possible to establish 
many species which belong to several genera. Occasionally the 
series of remains is sufficiently large to give grounds for a con- 
jectural reconstruction of the animal; but more frequently the 
bones are limited to a few caudal vertebree; and even the larger 
sets of associated bones come chiefly from the caudal and sacral 
regions of the vertebral column. With the exception of Macruro- 
saurus, already described*, and also known from a long sequence 
of large caudal vertebre, all the remains indicate animals of small 
or of moderate size, varying between the magnitudes of a sheep 
and an ox. The majority of the species were characterized by pos- 
sessing comparatively short tails; though one animal, at least, had 
a tail in which the vertebree were more than usually elongated. 
These remains possess a peculiar interest in being the latest known 
representatives of the Dinosauria in British geological deposits ; and 
they help to define the limits within which the osteological structure 
of the order varied and persisted in that organic type. 
The literature of British Upper Cretaceous Dinosauria is very 
scanty. Professor Owen, in 1860, figured in the Paleeontographical 
Society’s monograph (2nd Suppl. to Jguanodon, pl. vii. figs. 15-17) 
two Dinosaurian teeth from the Cambridge Greensand, one of which 
resembled Hadrosaurus, while the other was like Jguanodon. Ihave 
never seen either specimen, and, so far as I am aware, no other 
Dinosaurian teeth have ever been met with; they were, I believe, 
the property of Mr. Beddome, of Trinity College, who, when at 
Cambridge, made considerable collections of vertebrate fossils. These 
teeth would now be invaluable, because I am not acquainted with 
any English Greensand skeleton which I should be disposed to 
identify with either Iguanodon or Hadrosaurus ; and the teeth, with- 
out actually pertaining to those genera, may perhaps indicate the 
directions of the affinities of some of the Cambridge species. The 
next contribution to knowledge is Professor Huxley’s classical paper 
on Acanthopholis, from beds just above the Greensand at Folkestonet. 
* Quart. Journ. Geol. Soe, vol. xxxii. p. 440. + Geol. Mag. vol. iv. p. 65, 
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