MESOZOIC VEliTEBBATA. 
36a 
, ^ ( ailtero-posterior... 
Diameter of the shaft { t^.^us^.^rse .... 
Diameter of the distal end j transverse. 
Transverse diameter of the head of the humerus. 
^ , ( antero-posterior 
Diameter of the extremity of the Dilna. | transverse. 
Length of the external metacarpal. 
^ ^ » antero-posterior. 
Pro^iimal ilTameter j . 
^ ( antero-posterior. 
Diameter of the shaft J transverse. 
Diameter distally J transverse. 
Length of the median metacarpal (stouter). 
^ . „ 4 antero-posterior.. ... 
Diameter proximally J transverse. 
Diameter of the shaft (transverse). 
^ ( antero-posterior. 
Diameter distally {transverse.... 
Length of the median* metacarpal (slender). 
Diameter of the proximal end | transverse .. 
Diameter of the shaft (transverse).. 
Diameter distally jtttt„s,,^tse . 
0. 080 
0. 078 
0. 085 
0.145 
0.100 
0.110 
0.150 
0 , 210 
0..045 
0.100 
0. 033 
0. 007 
6. 050 
0.115 
0. 245 
0. 057 
0. 115 
0. 055 
0. 074 
0. 088 
0. 240 
0. 057 
0. 089 
0. 049 
0. 041 
0. 083 
More than usual interest attaches to this fossil. It is the first one found 
in the Triassic beds of the Rocky Mountain region, and was derived from 
an inhospitable region rarely traversed by white men. The locality is in 
the Painted Cailon, not far from the Sierra Abajo, in Southeastern Utali, 
near the Colorado boundary; latitude 38° 15', longitude 110°. This cailon 
is one of those tributary to the Great Colorado River, and is without water. 
The rock is described by Professor Newberry as the same as that which I 
have identified in New Mexico as the Trias, and is of the usual red color. 
The occurrence of a terrestrial Dinosaurian at that locality tends to con¬ 
firm the conclusion to which I have already attained, that this immensely 
extended deposit is of lacustrine character. 
Professor Newberry gives an interesting account, in his report to Cap¬ 
tain Macomb,* of the locality in which the bones of this reptile were found. 
* Exploring Expedition from Santa F6 to the Junction of Grand and Green Rivers, 
1859, p. 91 (1876). 
