0. C. Marsh—Structure of Mosasauroid Reptiles. 457 
Length of ulna, 104° mm. 
Length of ilium, 153° 
Length of ischium, ..138" 
PEE OE. DRYER y hice mn nach wean tensaed Gale yee 175°- 
OE ST in eee 116° 
Rene OF HOB. ss kc ene 56° 
Greatest diameter of proximal end, 40° 
i 33° 
This species may be distinguished from Jodon curtirostris 
Cope, perhaps its nearest known ally, but a smaller species, by 
the number of teeth in the maxillary, which are eleven instead 
of ten; by the more anterior nareal expanse; and by the supra- 
occipital Snel which is inclined obliquely forward. The two | 
latter characters separate it also from Holcodus corypheus Cope, 
from which it differs likewise in its large quadrate. From the 
other allied species, the description given above will readily 
separate it. 
The remains of this species here described were found last 
summer by Mr. F. Mead, Jr., of the Yale College party, and the 
writer, in the upper Cretaceous shale, near the Smoky Hill 
River, in Western Kansas. 
Lestosaurus felix, sp. nov. 
been much less dep 
type specimen by pressure. 3 ; 
interspace between the second and third teeth behind the inter- 
beyond the 
te 
dae si are slightly deflected. The stapes and columella 
ound with this skull’ have already been described. The teeth 
rine are eleven in the maxillary, and twelve in the mandible. 
+ og ing to the jugal bone, is a single dermal scute, which 1s 
ick, and pitted externally. 
a say ala ag are perfect, and the left is represented on 
