1877.] 187 
[Cope. 
Another vertebra of nearly the same character, and one-half smaller size, 
presents a greater difference between the long diameters of the upper and 
lower sides. The superior diameter is only one-half the inferior, and the 
foramen chorde dorsalis much nearer the superior than the inferior mar- 
gin. Its diameter is one-fourth the vertical and one-third the transverse 
diameter. 
From the same locality and discoverer as the C. gibsoni. 
LYSOROPHUS TRICARINATUS, Cope, gen. et sp. nov. 
Char. gen. Vertebree amphicelian, perforated by the foramen chord 
dorsalis. Neural arch freely articulated to the centrum. Floor of neural 
canal deeply excavated. No processes nor costal articulations on the cen- 
trum, which is excavated by longitudinal fosse. Centrum not shortened. 
This genus resembles in the proportions of the centrum, the genus Olep- 
sydrops, but differs in many details. 
Char. specif. Two centra and a portion of a third represent this species. 
The former area little longer than wide and a little depressed. The facet 
for the neural arch is an elongate plane truncating the border of the fossa 
of the neural canal on each side, for one-half to three-fifths the length of 
the centrum. Two deep longitudinal fosse extend on each side of a 
median rib of the inferior face ; and they are separated above by a narrower 
rib from another longitudinal fossa which is below the base of the neural 
arch. 
Measurements. M. 
loyneaiRKObhreNle Go Go somonaded S000 .0055 
Dinmeter: of; Centrum << VELA fo. oc =i ci-.cieicl elaielsieel> ee .0038 
TANS VETSEk. a alsin ciel sta telareiev~ al .0040 
Length of facet for neurapophysis. ............ee-e0- .0035 
Wrclin Gtingniell canil, GescoosebunscooudoddoUooduGE .0020 
Discovered by Wm. Gurley, near Danville, Llinois. 
DIPLOCAULUS SALAMANDROIDES, gen. et sp. nov. 
Char. gen. Vertebral centra elongate, contracted medially, and per- 
forated by the foramen chord dorsalis ; codssified with the neural arch, 
and supporting transverse processes. Two rib articulations one belotv 
the other, generally both at the extremities of processes, but the inferior 
sometimes sessile. No neural spine nor diapophysis ; the zygapophyses 
normal and well developed. 
The vertebrx of this genus much more nearly resemble those of a sala- 
mander than any hitherto found in this formation, but it will be necessary 
to observe the cranium before this point can be determined. 
Char. specif. One of Dr. Winslow’s and two of Mr. Gurley’s 
sendings contain vertebre of this species. One from the latter gentleman 
is contained in a mass of clay in immediate contact with a mandibular 
.Yamus which supports a number of teeth. The ramus appears rather too 
