TWENTY-NINTH ANNUAL MEETING. 121 
what cordate in shape, and in showing no surfaces for articulation of the chev- 
rons. The ends are concave as in the intercentrum, and the notochordal foramen 
is of the same relative size. The anterior lips of the cup are more beveled than 
the posterior ones. The outer surface is concave longitudinally, with an obtuse 
keel below. The posterior sutural surface for the arch is much larger than the 
anterior. There are no longitudinal ridges on the sides of the centrum, as shown 
in the figures of C’. crassidiscus Cope (labeled C. heteroclitus by Zittel). The 
floor of the neural canal is flat. 
Transverse diameter of centrum....... 15 mm. 
Vertical diameter of centrum .......... 113) ce 
eng thioh centri. «5 .ns..s-4 en oase lgae® 
Width of neural surface.......... Beets ie 288 
Numerous portions of sculptured scutes and plates and a fragment of a jaw 
with one complete tooth I doubt not belong with the vertebre. 
None of the characters are sufficient to distinguish the species from the other 
described ones, especially C. heteroclitus Cope. 
A single dorsal vertebra, and perhaps some phalanges, belong clearly to the 
genus Clepsydrops Cope, also originally described from Illinois, and are closely 
allied to the typical species. In its description I follow Cope’s language in the 
paper first cited for a dorsal centrum: ‘‘It is deeply biconcave, the articular 
cavities being funnel-shaped and continuous, thus perforating the entire length 
of the centrum. . . . The cavities communicate by a very small orifice. In 
an anterior dorsal the anterior cavity is as widely excavated at the border as the 
posterior funnel. Another peculiarity is the absence of the processes of the 
centrum, and a small capitular articulation is seen sessile on the border of the 
cup of two of the dorsals. The dorsal vertebre have their sides somewhat con- 
tracted. In one specimen the inferior face is longitudinally acute. In this 
dorsal the floor of the neural canal is interrupted by a deep fissure, which has a 
triangular shape, with the apex downward when seen in profile. The diapophy- 
sis does not project far beyond the base of the neural arch.’’ It is sessile, with 
an elongated, cupped articular surface. 
The phalanges are of more slender form than those of Cricotus. The shaft is 
depressed and the distal condyle is not emarginate. 
Length of centrum .............. 15 14 mm. 
Depthsbehind) Wie. ..eee ae ~ UD is 
Width: behing 04; Asn eet. 4s, 1D) “84 
Length of phalange.............. diy’ 
Depth, proximalliyen ase sereeent ee mS 
Width: proximally eeeeaer eee Bi £5 
As will be seen, the centrum, while nearly the same size as that measured by 
Cope of C. collettii (second column), are of somewhat different proportions, but 
not sufficiently so to justify specific separation. 
Associated with these remains are numerous teeth and spines of Plewracan- 
thus (Didymodus ?) and plates of a ganoid fish. 
All together, we have here an interesting series of forms, so closely resembling 
the species described by Cope from Danville, Ill., that I cannot distinguish them 
specifically. It would seem to demonstrate the contemporaneity of the two for- 
mations, and also that of the Texas Permian, whence the species of all these 
genera have been described by Cope. 
Above the stratum in which these bones are found are®several hundred feet 
of limestones and shales, above which come the red beds of Clark and Comanche 
