Cope.] 238 [Dee. 21, 
form of the neural spines, which are transverse to the long axis of the cen- 
trum. That of one of the vertebrie is strongly emarginate so as to be bi- 
furcate. The widely extended diaphophyses support the rib articulations, 
and there are no capitular articular facets on the centra. 
The cervical vertebra is depressed, the anterior or convex extremity of 
the centrum the most so. It is remarkable for its elongate form, exceeding 
the proportions found in known Dinosauria and Crocodilia, and resembling 
that seen in some fluviatile tortoises. Near the anterior extremity a short, 
robust parapophysis has its origin, from which it extends outwards and 
downwards, and soon terminates in a truncate extremity which presents 
downwards. A deep fossa occupies its upper base, and above this a deep 
linear foramen extends throughout the greater part of the length of the 
centrum. If this vertebra possesses a diapophysis it is rudimental. 
The caudal vertebrae are amphiceelian, but not deeply so. They are sub- 
quadrate in section, and not so short as the corresponding ones of Hadro- 
saurus. The most anterior one of the series has short, robust diapophyses, 
and is more concave anteriorly than posteriorly. The other caudals are 
more equally biconcave, but the cavity is very shallow on the most distal 
of them. The centrum is relatively more elongate and compressed than 
those of the others. None of them display the lateral pneumatic fossa 
which exists in the dorsals, and where broken so as to permit a view of 
the internal structure, the latter appears to consist of rather finely spongy 
tissue. The chevron facets are not very well defined, and the neural spines 
are of usual forms, and on two anterior vertebree elongate. 
Many peculiarities are exhibited by the vertebrie of this species, which 
are not described in saurians known up to the present time. Many of these 
would have been lost in less careful hands than those of Mr. Lucas, and 
science is much indebted to him for the preservation of many walls and 
buttresses of light proportions. In general the external walls of the centra 
are thin, and the processes are composed of laminze united by narrow mar- 
gins. The vertebre are lighter in proportion to their bulk than in any air- 
breathing vertebrate. 
The anterior extremity of the centrum of ie cervical vertebra is promi- 
nently convex, and muchdepressed. The posterior and concave extremity 
is wider, and of rather greater vertical diameter. The base of the neural 
arch only occupies half of the length of the centrum, an equal extent of 
the superior surface extending freely beyond it at its anterior and posterior 
extremities. 
The linear lateral foramen commences a little behind the anterior base of 
the neural arch, and descending somewhat in its direction, terminates be- 
neath the posterior extremity of the base of the neural arch. The base of 
the latter overhangs the foramen and the base of the transverse process. 
The interior surface of the centrum is concave, the concavity being bounded 
in front-by the inferior convex thickening of the extremity. Behind the 
middle the surface becomes plane, and is, near the posterior extremity, 
bounded on each side by a short angular ridge. 
