1869. ] HUXLEY—TRIASSIC DINOSAURIA. 43 
especially was this resemblance apparent in the so-called “ coracoid ” 
(fig. 11), which seemed obviously to be a Dinosaurian ilium—and 
in the femur, the likeness of which to that of Megalosaurus is noticed 
by the able authors of the memoir themselves, and it has been sub- 
sequently referred to by Professor Owen (Paleontology, 2nd ed. 
p- 278) as “a Dinosaurian femur.” It seemed to be highly desirable 
that these fossils should be examined anew; and in consequence of 
a communication to Mr. Saunders, they were placed at my disposal 
in the most obliging and liberal manner. On visiting the Bristol 
Museum, more than a hundred different specimens were spread 
_ before me, and I was able to select from among them illustrations 
of the structure of the skeleton of almost every part of the body of 
the ‘‘ Thecodontosauria,” and to obtain proof that these singular 
reptiles were in all respects Dinosauria. 
I hope to publish an account of these remains, with full details and 
illustrations, in the Memoirs of the Survey. For the present I con- 
fine myself to the bones which, taken together with those already de- 
scribed, demonstrate the Dinosaurian affinities of the Thecodonts, 
and determine the relations of the latter with other Dinosauria. 
In their well-known memoir*, Messrs. Riley and Stutchbury 
founded the genus Z'hecodontosaurus upon an imperfect mandible, 
containing twenty-one teeth (which was apparently the total original 
number) in a series. These teeth, they say, are acutely pointed and 
flattened, and the anterior edge is curved backwards and serrated ; 
the posterior edge is also slightly curved and strongly serrated, the 
serratures being directed towards the apex of the tooth. The middle 
teeth are the largest ; and all the teeth possess a conical pulp-cavity 
(Pl. IIT. figs. 1 & 2). Toa single specimen of a broadly lanceolate 
tooth, with serrations at right angles to the axis, they attach the 
name of Palcosaurus platyodon. Another solitary tooth of more 
elongated conical form they term Palewosaurus cylindrodon. The 
description of the teeth of Thecodontosaurus is perfectly accurate ; 
but I can see no important difference, in the direction of the serra- 
tions or otherwise, between these and the tooth called Palwosaurus 
platyodon, which, I suspect, may belong simply to a larger T'heco- 
dontosaurus. 
In the tooth termed Paleosaurus cylindrodon, on the other hand, 
the direction of the serrations is really at right angles to the axis of 
the tooth ; and in its form, also, the tooth more resembles that of 
Megalosaurus, being elongated, with the posterior margin straight or 
slightly concave, while the anterior contour is convex. The sharp 
posterior median ridge of the tooth extends for the whole length of 
the crown, and is strongly serrated throughout. The anterior ser- 
rated ridge is visible in what remains of the upper part of the 
crown ; but I am unable to trace it in the lower half of the front 
face of the enamel (Pl. III. fig. 3). I think it will be proper to 
* “A description of fossil remains of three distinct Saurian animals recently 
discovered in the Magnesian conglomerate near Bristol, by Henry Riley, M.D., 
and Mr. Samuel Stutchbury, A.L.S.,” read March 23rd, 1836. 
