J. W. HULKE ON POIKILOPLEURON BUCKLANDI. 237 
order Dinosauria been then known as we now know it, I believe his 
sagacity would have quickly seized the order and the place to which 
his Saurian rightly belongs. He knew Megalosaurus only by the 
poor figure of its sacrum in Cuvier’s ‘Ossemens Fossiles,’ and by 
teeth which he mentions had been found near Caen. I may add 
that there is in the British Museum the distai end of the tibia, 
probably from the same district. It once formed part of the Tesson 
collection. 
Since the above Note was written and sent in, Mr. James Parker, 
cf Oxford, the fortunate possessor of a magnificent collection of 
Megalosaurian remains, has most obligingly afforded me the oppor- 
tunity of ascertaining the internal structure of the caudal vertebral 
centrum in this Saurian, by breaking across one in a chain of several, 
which by their close association with other indubitable Megalo- 
saurian remains (teeth, limb-bones, &c.) in which they were found, 
as also by the close correspondence of their facies with these, are 
undoubtedly genuine remains of this Dinosaur. In the interior of 
this caudal centrum is a large medullary cavity (now filled with 
matrix), as in the reputed caudals of Potkilopleuron. With this 
structural agreement the last alleged skeletal fact in support of the 
individuality of Povkilopleuron disappears. 
From Prof. Morris, to whom my warm thanks are due for in- 
formation most kindly given, I learn that some difference of opinion 
exists regarding the position of the Calcaire de Caen. D’Orbigny 
and D’Archiac regarded it as the equivalent of the Great Oolite, 
Deslongchamps as represeuting the Fuller’s Earth. The lists of fossils 
occurring in it, however, Prof. Morris writes, contain some which 
in this country and elsewhere are referred to the Inferior Oolite. 
February 2, 1879. 
EXPLANATION OF PLATE XII. 
Fig. 1. Tibia of Poikiloplewron. Front view of distal end. 1a. Back of same. 
. Astragalus of Poikilopleuron. Front view. This and fig. 1 form pl. vii. 
f. 12 and pl. vi. fig. 3 in Deslongchamps’s memoir. 
. Tibia of Megalosaurus. Front view. Royal College of Surgeons. 
Tibia of Ceteosaurus. Phillips’s ‘Geol. of Oxford.’ 
Tibia of Jgwanodon Mantelli. Front view. Brit. Mus. 
. Tibia of Hadrosaurus. Front view. From Leidy’s ‘Cretaceous Reptiles 
of the United States.’ 
. Tibia of Hyleosaurus. Front view. Brit. Mus. 
. Astragalus of Zgwanodon. In the collection of Dr. H. P. Wilkins. 
Nore 
CO~T Hopes 
Discussion. 
Prof, Sretey felt disposed to doubt from the diagram whether the 
species, at any rate, were identical ; still, as Mr. Hulke had so many 
opportunities of studying the specimen, he thought the identity of 
