1878. | Geology and Paleontology. 563 
ures of value, mothers-in-law, the umbrella as a mark of dignity, 
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GEOLOGY AND PALÆONTOLOGY. 
A NEW SPECIES OF AMPHICCELIAS.—I have recently received 
from my indefatigable friend, Mr. O. W. Lucas, the almost entire 
neural arch of the vertebra of the largest saurian I have yet seen. 
It was found in the Dakota formation of Colorado, near Can- 
yon city, in the same bed that has thus far produced the known 
species of Camarasaurus, Amphicelias, Fypsirophus, etc. In the 
extreme tenuity of all its parts, this vertebra exceeds those’ of 
this type already described, so that ticks care was requisite to 
secure its preservation. It exhibits the general characteristics of 
the genus Amphicelias, in the hyposphen, antero-posteriorly 
placed neural spine, and elevated diapophysis for the rib articula- 
tion. The diapophyses are compressed and supported by a supe- 
rior and inferior, and anterior and posterior, thin buttresses, sepa- _ 
rated by deep cavities. As compared with the Amphicelias altus, 
this reptile differs in the greater elevation and attenuation of the 
neural spine, as well as its different form; also in the generally 
more laminar character of its buttresses and walls The double 
rib of the anterior border of the spine of the A. altus is here rep- 
resented by two laminæ which extend on each side, so as to give 
a horizontal section of the spine a T shape. The posterior zyga- 
pophyses have less lateral expanse than in A. a/tus, but they con- 
tinue as horizontal lamina with a deep cavity above and below: 
their superior surfaces contract into two ridges, which are sepa- __ 
rated by a deep groove. These ridges, unlike the anterior ones, 
‘approximate to each other closely on the border of the spine 
Summit of the spine is wanting. The measurements are: > tol a= 
elevation of neural arch preserved, 1500 m.; elevation of poste- 
‘VOL. XIT.—NoO. 30 
rior HEE 585; transverse expanse of posterior zyga- — : — 
