9 
Cope.] 276 [Dec. 17. 
other bones, including the cranium were found only covered by the super- 
ficial washed material. Other portions were exposed on excavating the 
blue grey bed of the side of the spur adjoining. 
The name has reference to the abbreviation of the head and jaws. 
LIoDON GLANDIFERUS, Cope, sp. nov. 
This species is represented by portions of two individuals from locali- 
ties twenty-five miles apart. These are unfortunately in each case only 
a cervical vertebra, but they agree in possessing such peculiarities as dis- 
tinguish them widely from anything yet known to the writer. 
One is an anterior, the other a posterior cervical. The articular sur- 
faces are transversely elliptic, and completely rounded above, that is, 
neither truncated nor excavated for the neural canal. Their vertical axes 
are oblique, 7. ¢., make less than a right angle with the long axis of the 
centrum, and the articular surface of the ball is thus carried forward, on 
the upper face, to much nearer the base of the neurapophyses than usual, 
in the anterior vertebra nearly touching them. The ball is likewise more 
convex than in any other species, having a slight central prominence in 
the posterior vertebra. There is no annular groove round the ball. In 
both, the articular surface of the hypapophysis is truncate and bounded 
by an elevation in front, a peculiarity not observed in any of the species 
already described. There is no trace of zygosphen in either. In the an- 
terior vertebra the diapophyses are nearly horizontal, the posterior por- 
tion slightly thickened and oblique. The anterior portion is thinned out 
and very rugose above and below, and does not continue its margin into 
the rim of the cup. In the second vertebra, the diapophyses are very 
large, vertical and with a horizontal portion rising in a curve to join the 
middle of the lateral margin of the cup. Neural spine narrowed upwards 
keeled behind. 
M. 
Length centrum anterior vertebra..................+ 0.064 
1D; ask Ba VEDULGOI Vs eR Eos. atu ev coats 03 
Diameter ball t erunsvorss Tie Lier! 035 
Meme Gh) OM DOSUCHIONs 4 06a (csc a el crs. ee es os es -064 
: Rie a OU VOLUIGDIG Vip ccc ees cee ya eee re ene .03 
Diameter ball horizontals 2. eas ees ee 043 
Expanse of anterior zygapophyses: ::::.:3:..-..52.... 055 
The first vertebra was found by the writer at the foot of a bluff on the 
lower part of the Butte Creek ; the second was procured by Professor B. 
F. Mudge from a point one mile south-east of Sheridan near the North 
Fork of the Smoky River. 
It is this species that I compared with the Mosasaurus depressus, Cope, 
in a report on the collection made by Professor Mudge (Amer. Philos. 
Soc., 1871, 168 Proceedings). The size is similar, but the form of the 
articular surfaces is very different. 
Liopon LATISPINUS, Cope. 
Proceed. Amer. Philos. Soc. 1871, p. 169. 
This is a large species, nearly equaling the Z. mitchellid in its dimensions. 
