54 
E0CENI5 TESTUDINATA. 
the pectoro-hiimeral suture, and tlie postabdominal bones are much less 
deeply excavated and furcate. The vertebral bones, I have in three New 
Mexican specimens of the E. laiivertebraliSj the mesosternal and episternal in 
five, and the postabdominals in three. The characters of the E. vyomingensis, 
I have verified on numerous specimens obtained by myself in Wyoming, 
and in the figures and descriptions of Dr. Leidy.* In one of my examples 
of E. lativertebralis^ the pectoro-humeral suture creeps over the posterior 
margin of the mesosternal bone, keeping close to the edge, which observes 
its normal transveVse direction. 
The following description is that of the most complete specimen. 
Eight vertebral and a nuchal bones are preserved, which, when placed in 
relation, present a vacancy for the third vertebral. The pygal is wanting, 
while the caudal marginal is present. The first vertebral bone is wanting, 
but the outline of its posterior portion is indicated by the bones which 
bound it. Its lateral borders are gently convex, and do not diverge much 
from the similarly convex posterior border. Its length exceeds its width. 
The posterior sutures of all the vertebral bones from the second to the fifth 
inclusive are regularly shallowly concave, the posterior sutures corre¬ 
spondingly convex; in the posterior vertebrae, they are bracket-shaped or 
transverse. The antero-lateral angles of all from the second to the eighth 
inclusive are obliquely tinncate. The second and third are as wide as long; 
the remainder are wider than long. The sixth is twice, the seventh more 
than twice, as wide as long. The eighth is wider before than behind and 
urceolate, with anterior lateral angles broadly ti'uncated; it is half its width 
wider than long. All of the vertebrals are flat, excepting the pygal, which 
is convex on its median line. The costal bones are of moderate thickness, 
and without sculpture; their capitula are w^ell developed. The nuchal 
bone is thickened, and its marginal portion is not very wide, and is openly 
notched at the middle. The caudal is smaller than the other marginals, 
subquadrate, moderately recurved, and roof-shaped in section at the poste¬ 
rior border. Tlie costal buttress for the ascending process of the bridge 
is not promineni. On the first costal, it is a slightly-raised sutural face 
near the distal end, and 0.75 of an inch anterior to the posterior suture. 
*R(>port U. S. Geol. Survey Terrs., by Hayden, i, p, 140. 
