O. C. Marsh—New Tertiary Reptiles. 309 
deep, and met each other ata considerable angle. The sym- 
physis is short, and its surface nearly smooth, showing that the 
tami were but slightly attached. The groove for Meckel’s 
cartilage is unusually large. The animal represented by the 
remains preserved was probably not more than a foot in length. 
Measurements. 
Space occupied by four anterior lower teeth, ........... ane 
Depth of jaw below fourth tooth, ..........0+.0e00. ioe 
Meer or iw at thix points. ween. nocacacshertkabn neon 16 
Length of BY URD YSN 5 6 dog oie hace 0 oe bee aE 2 
_ The specimen here described was found by Mr. O. Harger, 
in September last, near Henry’s Fork, Wyoming. 
Iguanavus exilis, gen. et sp. nov. 
tion. The specimens that can now be plac 
belonged to animals about two feet in length. 
Me 
easurements. 
Length of twelfth caudal vertebra on lower surface, ..... oT = 
Dsverse diameter of articular cup,.......-..s++--+++: 2 
Vertical GiAMeteR: Vs cise beast RO Pe aye ear 18 
Transverse diameter of articular ball, ... cscs sne csess 2 
The remains above described were found last September, by 
the writer, near Henry’s Fork, Wyoming. 
Limnosaurus ziphodon, gen. nov. 
Crocodilus ziphodon Marsh. This Jour., vol. i, p. 453, June, 1871. 
Additional remains of this species, since obtained by the 
Yale party at the same locality as the type specimen, clearly 
show that it belongs to a genus quite distinct from the modern 
Crocodilus, The sharp, compressed teeth, with both edges 
Serrated, differ widely from those of any known Crocodilians, 
and alone afford a distinctive character. Others w 
Stven in the full description. 
Yale College, New Haven, Sept. 21st, 1872. 
