| 334 O. OC. Marsh—The Order Theropoda. 
Midi ds Sie ee a weak joint.. This feature is 
shown te &, fi figures 2, 3, and 4 
The ans of this new So of vertebra shows that the 
terms opisthoeclian and proccelian, in general use to describe 
the centra of vertebree, are inadequate, since they relate to 
one end only, the other being supposed to correspond in form. 
The terms convexo-concave, concavo-convex, plano-concave, 
etc., would be more accurate, and equally e uphonious. 
In Ceratosaurus, as in all the 7) b hepadi. except Calurus, 
the cervical ribs are articulated to the centra, not codssitied 
with them, as in the Sawropoda. The latter order stands almost 
alone among Dinosaurs in this respect, as both the Rigor 
and the Ormithopoda have free ribs in the cervical regio 
The dorsal and foinbad vertebree are bi-concave, vith ‘only 
moderate concavities. The sides and lower surface of the cen- 
in Plate XIV, fi 
All the presacral vertebrae are very hollow, and this is also 
true of the anterior caudals. 
There are five well coéssified vertebrae in the sacrum in 
the present specimen of Ceratosaurus nasicornis. The trans- — 
verse processes are very short, each supported by two vertebra, 
they do not meet at their distal ends. 
ee the type specimen of Creosawrus, there are only two 
sacral vertebrae codssified. In Megalosawrus, there are five, 
and the number appears to vary in different genera of the 
BR as it does in the Sawropoda. 
The caudal vertebrae are bi-concave.. All the anterior cau- 
dals, except the first, supported very long arava indicating 
a high, thin tail, well adapted to ‘swimmin he tail was 
quite long, and the distal caudals were very short. 
THE Fore Lips. 
- a limbs in AJdlosawrus, and in fact in all known 
were very small. The scapula and coracoid re- 
which formed most effective weapons. These claws, in some 
allied forms, have been referred to the hind feet, but the lat- 
ter, in all the known Theropoda, have their claws round, 5 BNE 
not compressed. a) fore limb of Adlosaurus fragilis Wo, 
shown on Plate XII ae: 
