1879. } Geology and Paleontology. 403 
teristic. The centrum is little depressed, the vertical me trans- 
verse diameters of the cup being nearly equal. he form is thus 
mu ore slender than in the C. supremus, indicating ù neck 
sisal esi like that of the 7rionyches or Chelodine 
The parapophyses descend backwards and downwards from the 
edge of the anterior ball; they are acini shorter than the dia- 
pophyses, which are decurved. The side of the centrum and coés- 
the parapophysis. Still another divides the posterior base of the 
neurapophysis, on each side of the neural arch. The posterior 
2. 
EXPLANATION OF CUTS. 
Cervical vertebra of Camarasaurus leptodirus, one-tenth natural size. 1, right 
side; 2, aaas rend; 3, inferior surface. Fig. 1 is taken from one vertebra ; figs. 
2an d 3 from another 
zygapophyses support a strong superior crest, and their superior 
edges converge to meet at an angle without forming a neur 
spine at or posterior to the middle of the length of the neural 
arch, as is the case in Epanterias amplexus. The external bases 
of the zygapophyses are excavated deeply. Length of centrum 
Mm, .430; vertical diameter of cup, .140; transverse > .160 ; 
