Fer aNN A Dil tame Cate Lin oi ie area sei Al Sah 8 
O. C. Marsh—American Jurassic Dinosaurs. 491 
Ebates: one sp. nov. 
vertebrae are less massive, the differences — ercaiy 
noticeable in the zygapophyses. The anterior caudals, more- 
over, are without the cavities noticed in the type species, and 
leas nee ed than the Eee ae ae part in Brontosaurus 
ewcelsu, pi metacarpals of the present species are more 
tee than in the other known members of the group. 
Diracodon laticeps, gen. et sp. nov. 
A new Jurassic Dinosaur of moderate size is je pea by 
various remains, among which are the tw ary bones. 
These are unusually slender, and peculiar in ihe, ‘ar e number 
of teeth they contained. These teeth resemble in form those 
of Echinodon, Owen. ey have compressed serrated crowns, 
sculptured on both sides. The base of the crown is expanded, 
and below this is a distinct neck, which will readily distin- 
guish these teeth from any hitherto found i in this country. Th 
teeth are implanted in distinct sockets, and there were twenty- 
two in each maxilla There is a foramen on the inner 
side, just below each tooth, and some ao oe on the 
outer side of each jaw. The teeth are ve 
e front of these jaws is edentulous, acd 1 this part curves 
pad so far that the snout must have been a broad one, 
almost batrachoid in form. 
can following measurements indicate the size of these speci- 
ens: 
ihaes length of pany boke. .ce dats tues 179e™ 
Space occupied by sade <nige pa aes ee 104° 
Space occupied by eleven sanpgios teeth ae ae. OO 
ength of ave sdaatilone idee cece se 62 
Vertical diameter of jaw, above releveue tooth.. 27° 
The present species was probably ten or twelve feet in 
length. The vertebre referred to this animal are biconcave, 
genus is most nearly related to Laosaurus. The known 
remains are from the Atlantosaurus beds of Wyoming. 
