9A 
1877.) 245 [Cope. 
MotalkelevatlonyOteverteniay. acetates scicclee ces | Le LOO 
Wemeihvoimeurales(ines 5. ccmectgeea sss cosa ses cern | OOO 
Elevation of anterior zygapophyses.................. .500 
( antero-posterior ......... .160 
Diameter of neural spine ~ transverse (at middle).... — .065 
‘ se at summit.:..  .140 
Depth of centrum below pneumatic foramen......... 120 
Fore and aft diameter of pneumatic foramen......... — .080 
TGenehieGn PULTE HONE 26 es ncicden arses = stewiemocds, 2.060 
Minckness ob stoutesh Extremityz. sencarsecccssnees ce | LAO 
PEMOTM Of LCUMET sella eat acceckiss asides nce <Stactcccee 1.004 
Transverse extent of proximal end.... ............. .420 
nie Senos MCONGMICN 5 stainless yes cwdsacic) bse) 
Diametenon mid qleoirshattsceacs ces eaecte ceecee aces | icc 
Distance from head to third trochanter............... .665 
Diametenor headi(compressed)\sasa-citsc- cil ssaciias=) «OU 
AMPHIC@LIAS LATUS Cope. 
Paleontological Bulletin, No. 27, p. 4. 
Of the wonderful fauna of the Dakota epoch of the Rocky Mountains 
the Camarasaurus supremus 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 vertebre which are in good preservation. They reveal 
the existence of another saurian of huge 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 depressed form, which take their 
origin below the base of the neural arch. The centra 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. 
