340 O. C. Marsh—Extinct Jurassic Reptiles. 
inclined, showing that the neck was curved. The anterior 
cervical ribs were codssified with the centra, as in Birds. Fig- 
ures 1, la and 10, Plate x, represent a cervical vertebra from 
near the middle of the neck. e cavities in the cervicals are 
connected with the soutide by comparatively large pneumatic 
openings. The neural canal is very large, and traces of the 
neuro-central suture are distinct. 
The dorsal vertebrae of Celurus are much shorter than the 
cervicals. The centra have a deep cup in front, and a shallow 
concavity behind. These articular faces are nearly at right 
angles to the axis of the trunk. The neural spine is elevated, 
and compressed. The transverse processes are elongate. The 
a 
ribs preserved have undivide 
and the accompanying section shows the inner structure. In 
most of the caudals, the neuro-central suture has entirely 
Yale College, New Haven, March 14th, 1881, 
