638 SLOTD MES ORS SACL EIN AGS) 
showing that the animal was mired down in some hole or on the 
uddy bank of some body of water. 
Camarasaurus ( Atlantosaurus) was very similar to the preced- 
ing, differing in the fact that the sacral and the caudal vertebrez 
are solid, instead of having the large vacuities that are found in 
the same bones of the preceding genus and in the vertebre of 
the anterior region of this genus. The scapula of one specimen 
measured one and a half meters, and the femur nearly two. 
From the Upper Jurassic of Colorado. 
Morosaurus, Allosaurus, and Apatosaurus are all forms that are 
distinguished by minor characters of the vertebra, and limbs 
from the preceding genera. They are all from the same horizon 
as the preceding, in Wyoming and Colorado. 
Cetiosaurus is from the Upper Jurassic of England ; the form 
is so similar to that of the various American forms that Baur has 
suggested that all the genera from Colorado and Wyoming are 
possibly the same as the English one. The skeleton is only par- 
tially known, the head being missing in all the known specimens. 
It was nearly thirty-five feet in length, with about the same pro- 
portions of the fore and hind limbs, and the vertebre as Aronto- 
Saurus. 
Ornithopsis, from the Upper Jurassic of England and France 
is very similar to Cefiosaurus, but shows large vacuities in the 
sides of the dorsal vertebre. 
Diplodocus, from the Upper Jurassic of Colorado and Wyom- 
ing, is remarkable for the long cervical and caudal vertebre. 
The vertebrz were very light and hollow, those of the sacral 
region especially. The chevron bones, instead of being simple, 
with only the single V-shaped branch, were composed of two 
v-shaped branches that extended forward and back, and were 
united at the proximal extremities. The jaws were edentulous, 
except at the anterior ends, and these were supplied with long, 
slender teeth that were constantly shed and renewed from below, 
a specimen with as many as seven successive teeth in various 
stages of development being known. 
Titanosaurus is the name given to certain large vertebre, from 
