286 
Cope.) [Dece. 17, 1871. 
isch, length Ol Curve-. Ai vi oes es ss Nee aat ee soa ee 7000 
aes MONE Tepe gioco. visi ar cst HE 
Pubis,. letigth: (straight) ..0.....: ss). CGI i a ee hen 1/3, 
a *o.. UO SMGOTLOL DYOCESH:(fxtih). siesyuwes ss . eats 125 
ee bh fomarniottar re) See eatin 
Benin length. (ss etyew. te) eres S ei tere A vereatay LOD 
(Proximal... ......seseee ees ian weeeecees 6098 
fc WAG SOMCCIAT ye oo is seen pense 2 ay 064 
_ COE i iecceminene 130 
Fibula, length 116 
ale -4 ape, oe elon ats oN cn teen Neier 
oe PLORIMAL UMIGKNOSS: i #.. aso pene eee: poe 052 
- MAGUIM WICULe totes ste es ts Gcaret iw e eee, (US 
Mapa, LONG, ses is os vos ERS A eters ep erne 103 
( Wr ORUINGU TH 0 51 tos afi dew eee SN diet bh ane on es 045 
a WAGUE S MOCIaN ys cs baa ves rte EOS. AE ae 025 
ddietab cc eae . 4052 
tf, Htclenea | Reales ccs cudsectee ecesderess. 5.08) 
ialanse (posterior); lemma waiviess te veces tie. cs 08 
terminal ert cea ee ec ekens 015 
Estimated length, cranium (five feet). i... cece cece 1.510 
ee COUAl LONOUNN are ola ok TAR ee eeu %5 feet. 
This specimen does not appear to be quite as large as the type, which 
came from Fort McRae, New Mexico. The diameters of the vertebral 
centra appear to be larger in proportion to the length of the cranium than 
in the Mosasaurus dekayt, hence probably the body had a greater diame- 
ter. In estimating its length, reference is had to the relations in size of 
the caudal vertebra of the type of L. proriger and to the caudal series of 
a small Liodon found on the bluffs of Butte Creek. The caudal vertebrae 
are quite similar to those of the former ; in the latter, a series of thirty 
centra exhibit very little diminution in size. On such a basis the length 
would be about seventy-five feet. 
Portions of a second individual of this species or of L. proriger, were 
found on Fox Cafion. They belonged to a larger animal, one equal to 
the New Mexican first described. Professor Mudge has fragments of still 
larger specimens. 
The principal specimens above described was excavated from a chalk 
bluff. Fragments of the jaws were seen lying on the slope, and other 
portions entered the shale. On being followed, a part of the cranium was 
taken from beneath the roots of a bush, and the vertebra and limb bones 
were found further in. The vertebral series extended parallel with the 
outcrop of the beds, and finally turned into the hill and was followed so 
far as time would permit. It was abandoned at the anterior caudal ver- 
tebre, for more favorable circumstances, or amore persevering excavator- 
ian 
