1877] 245 
(Cope. 
Total elevation of vertebra ..............5. eas sateen . 1.100 
Length of neural spine.............00eccceeseeee ees 600 
Elevation of anterior zygapophyses..............2.2. 500 
{ antero-posterior ........ -  .160 
Diameter of neural spine 4 transverse (at middle)....  .065 
( eS at summit.... .140 
Depth of centrum below pneumatic foramen......... 120 
Fore and aft diameter of pneumatic foramen......... .080 
Length of pubic bone................. oie Risin. eteot peaks 1.060 
Thickness of stoutest extremity....... .......00.008 140 
Length Of femur. sosweiscavsoigaae us aces datekooes aes. 15524 
Transverse extent of proximal end.... ............. 420 
a HO SEES COMM ICS w05st Sceiaseuiacesn a hae, eNO 820 
Diameter of middle of shaft..............c0ceee eens 220 
Distance from head to third trochanter.............. F 665 
Diameter of head (compressed)............0ceeee008 r 260 
AMPHICGLIAS LATUS Cope. 
Paleontological Bulletin, No. 27, p. 4. 
Of the wonderful fauna of the Dakota epoch of the Rocky Mountains 
the Camarasaurus swpremus was preéminent in general proportions, the 
Amphicelias altus was the tallest, and the saurian now to be described, was 
the most robust. It is represented in Mr. Lucas’ collection by a right 
femur and four caudal vertebrae which are in good preservation. They reveal 
the existence of another saurian of huze dimensions, and of great mass in 
proportion to its height. 
The caudal vertebre are apparently from the anterior part of the series. 
They are ail strongly bi-concave ; the anterior face more so than the pos- 
terior. They all possess diapophyses of dépressed form, which take their 
origin below the base of the neural arch. The cenira are short in antero- 
posterior diameter, and do not present lateral angles. They are composed 
of not very dense osseous tissue. The anterior zygapophyses are rather 
elongate, and their articular faces are directed steeply inwards. They are 
received by corresponding shallow excavations, one on each side of the pos- 
terior base of the neural spine. The neural spines are compressed and 
straight, and become very robust towards the apex. 
The femur is extraordinarily robust. The great trochanter is low, but the 
shaft is widest where it expands outward. The third trochanter is a ridge, 
is above the middle, and is short and little prominent. It ison the inner edge 
of the posterior aspect of the shaft, and looks backwards and inwards. The 
shaft in its present state is compressed so as to reduce the antero-posterior 
diameter. It is not however crushed or cracked. The condyles have 
much greater transverse than antero-posterior extent. They are moderate- 
ly produced backward, and are separated by a deep inter-condylar groove, 
while the anterior trochlear groove is wide and well marked. The inner con- 
dyle is narrowed posteriorly, while the external one is obtuse and robust. 
