522 
Cope. |] 522 {April 5, 
of the premaxillary bone does not display any cutting edges nor facets. 
The grooves of inflection are strong, and extend well towards the apex, 
but they are not numerous. 
Measurements. M. 
Length of skull from muzzle to epiotic angle........... .100 
es ae ie supraoccipital.......... .090 
ee me se front of orbits.......... .045 
6 oe of nares (axial)..... Stree Ole 
Width of skull at extremities of quadrates.............. .0838 
ays (Suibetweenieplotic nameless: -tieiteacta-ee ee OGD 
ce ac se ONDUS ryegstow = oe heuet otenoteks ck crm OD 
se UGS GTO OMNI) SAogagacqssondGoagsecs, oie 
as GE" ENE EMRE 5 Ses acecuopcocanccaaaase ala, 
UProxeven he oot le eo) Gord ORO Gada aan es doer TG So no omee len 
From the same locality and horizon as the last species. 
CRICOTUS HETEROCLITUS Cope. 
Proceed. Academy Philada., 1875, p. 405. American Naturalist, May, 
1878 (published April 22d), p. 319. 
Specimens of a number of individuals probably referable to the above 
species, exhibit many of its characters. These are very remarkable, and 
indicate another type of vertebral column heretofore unkno wn. 
The intercentra are more largely developed than in any other genus, 
having the form and proportions of the centra in the caudal region, and 
being but little smaller in other portions of the column. In the prepelvic 
region, the true centra only bear neural arches, which are articulated, and 
bear short diapophyses at their base. On the caudal region they share the 
neural arches with the intercentra, while the latter bear the continuous 
chevron bones exclusively. The neural spines are well developed, and not 
prolonged, in both regions. The ribs are robust, and the abdomen is pro- 
tected beneath by a series of long, narrow and flat scales, which form im- 
bricated chevrons directed forwards at the middle line. 
The phalanges are short and wide, with but slightly condyloid articula- 
tions. The distal one is very short, and terminates in a narrowed obtuse 
projection, somewhat like those of man, but shorter. 
A cranium which accompanied the portions of the trunk above described, 
may belong to the same species. It is that of a Labyrinthodont in some 
degree allied to Trematosaurus. Its form is elongate and the orbits are 
behind the middle. The mandibles do not exhibit prominent angles, and 
the epiotic angles are not distinguished by a notch from the posterior bor- 
der of the os-quadratum. The epiotic bones and two supraoccipitals form 
the posterior boundary of the table of the cranium ; anterior to which the 
usual parietals and pterotics extend to the frontals and post-frontals. Be- 
low the latter is the postorbital, which is bounded behind by the squamosal 
(supra-squamosal, Owen, Paleontology, p. 176). The quadrato-jugal is 
possibly distinct from the large malar. There is a ‘“‘lyra’’ of two grooves, 
