406 General Notes. [June, 
GEOLOGY AND PALAONTOLOGY. 
A NEW OPistHocceLous Dinosaur.—I have recently received 
from the Dakota beds of Canyon city, Colorado, a number of 
bones of a new and remarkable extinct reptile allied to Camara-: . 
3 s (= Titanosaurus and Atlantosaurus Marsh nom. nud.), an 
Streptospondylus. The dorsal vertebre are strongly opisthoceel- 
ous, and are without lateral fossa or foramen of the centrum. 
The arch is freely articulated with the latter, and is not much 
elevated, and possesses no hyposphen. The neural spine is 
transverse; the diapophysis is supported on narrow buttresses, 
and the neural arches generally lightened by fossz as in the two 
genera named. A strong parapophysial tubercle near the ante- 
rior convexity receives the head of the rib. Each zygapophysis 
of one side is separated from that of the other by a deep con- 
cavity. e genus so characterized may be called Epanterias. 
and the species E. amplexus. The latter has a rather low an 
wide dorsal neural arch with small fore and aft diameter, and 
with a neural spine divided into three obtuse apices. There are 
three fossæ at the base of the diapophysis, the anterior one ver- 
tical; and a very deep one between the posterior zygapophyses. 
The cup of the centrum embraces the ball extensively, and the 
neurapophysis overlaps the side of the centrum behind. Length 
of centrum m..115; diameters behind, transverse, «120; vertical 
108. Elevation of neural arch .290; width of neural spine 083, 
of both diapophyses .400. This saurian was much smaller than 
the Camarasaurus supremus, and perhaps equal to the Hadrosau- 
rus foulkei. It may be associated with the former in the Cama- 
rasauride. With Amphicelias is probably in like manner to be 
arranged Tichosteus; while the carnivorous form /ypsirhophus 
represents a third type—£. D. Cope. 
. S à r 
Proceedings of the Philadelphia Academy for 1875, p- 404 2 
paper on this type of vertebrates commences, where some of 
_ the leading characters of the reptiles are pointed out. In the 
_ Proceedings of the AMerican Philosophical Society for May, 
> 1877 , Several new species are described from the same formation, 
_ and in the same journal for November, 1877, other species are 
added, making the whole number up to twenty-one. These 
wes os E a Sl E 
e eT lies ca: tg ee aR ces atic pM a, 
