1871,] a: 69 [Core. 
added to his collections by an excursion in the neighborhood of Fort 
Wallace, during the present summer. By his permission I have made an 
examination of these fossils, and find them to be of much interest. Chey 
consist of seven species of Pythonomorpha, and three of Sawrodontide. 
The following are approximate or exact determinations of them. 
PyTHONOMORPHA. 
Mosasaurus quite near to M. depressus, Cope, from New Jersey. 
Lropon pysPELOR, Cope, probably. The first time that this gigantic 
reptile has been discovered in Kansas. 
Liopon ; a large species near to L. proriger, Cope. It is represented 
by dorsal, lumbar, and caudal vertebrae, by ribs, and by bones of the 
extremities. The humerus is a remarkable bone having the outline of 
that of Olidastes propython, Cope, but is very much stouter, the antero- 
posterior dimensions of the proximal extremity being greatly enlarged, 
The long diameters of the two extremities are in fact nearly at right 
angles, instead of in the same plane, and the outline of the proximal is 
subtriangular, one of the angles being prolonged into a strong deltoid 
crest on the outer face of the bone, which extends half its length. The 
inner or posterior distal angle is much produced, while the distal ex- 
tremity is a flat slightly curved diamond-shaped surface. The radius is 
as broad as long and three quarters of a disc. The phalanges are stout, 
thick and depressed, thus differing much from those of Liodon ictericus, 
A. bone which I cannot assign to any other position than that of femur * 
hasa peculiar form. It is a stout bone but more slender than the humerus. 
The shaft is contracted and subtrilateral in section. The extremities are 
flattened, expanded in directions transverse to each other, the proximal 
having, however, a lesser expansion, in the plane of the distal end, The 
former has, threrefore, the form of an equilateral spherical triangle, the 
apex enclosing a lateral fossa and representing probably the great tro- 
chanter. The distal extremity is a transverse and convex oval. 
M. 
Length humerus.....--++-+++> PO en, Sec peeen eee U0; 
Proximal diameter dO... i. 5 :860 2 ee ope weer eye t es . .095 
Length femur ..... De ar 0 ee 08 
Proximal diameter do....... cere eee s cere t teeter tsetse eee ees 065 
Median Oe ee ot cosy hee A A eeu de conics Saban Oh rer 035 
Length centrum dorsal vertebra without DAU eee ees ss 061 
Transverse diameter CUP...... eee e seer etree eer ee ees So ee 06 
Vertical Die ae sire cablnine ere pheerney sae 30 doo ioe oe Se -053 
LIODON LATISPINUS, Cope, sp. nov. 
This is a large species, nearly equalling the L, mitchillat in its dimen- 
sions, that is forty or fifty feet in length. The remains representing it 
consist of seven cervical and dorsal vertebra, five of them being contin- 
uous and enclosed in a clay concretion. 
* Prof, 0. C, Marsh has discovered the posterior limbs in this genus and Clidastes but has as yet 
published no description ofthem. See Sillim, Journ. 1871, p. 448. 
A. P. S—VOL. X{I—V 
