1877.] ^^^ [Cope. 



the distal, and is subtriangular in outline ; the apex being acute and ex- 

 ternal. The surface is flat, and is strongly marked with deep grooves. 

 The other surfaces of the limb-bones are smooth, except a few weak ridges 

 near the distal ends of the two distal bones. 



Measurements. M. 



Length of part of scapula preserved 0.680 



Width at middle 0.270 



Thickness at middle 0.048 



Thickness at proximal angle (>. 117 



Total length of humerus 0. 765 



Diameter of shaft \ 



at head 0.080 



at tuberosities 0.225 



antero-posterior 0.080 



Diameter of proximal end-< \ , , .,. ^ aocr 



(at tuberosities 0.225 



transverse 0.078 



„. ^ ^ T X 1 1 ( antero posterior. 0.085 



Diameter of distal end ^ ^ ., -^ 



( transverse 0. 145 



Transverse diameter of head of humerus 0.160 



-p.. ^ ^ X -J. e » 1 ( antero-posterioi 0.110 



Diameter of extremity of ? ulna i r^ ^^r. 



I transverse 0.150 



Length of external metacarpal 0.210 



„ . , ,. ^ (antero-posterior 0.045 



• Proximal diameter < /^ -, /^^ 



( transverse 0. 100 



-p.. ^ x- 1 r. ( antero-posterior 0.033 



Diameter of shaft \ ' 



( transverse 0. 067 



T^. ^ J. . ,1 (antero-posterior 0.050 



Diameter distally < ^ ^-.^ 



( transverse 0.115 



Length of median metacar]5al (stouter) 0.245 



-p.. ^ .11 (antero-posterior 0.057 



Diameter proximally -i .. -.-.^ 



\ transverse 0. 115 



Diameter of shaft (transverse) 0.055 



-p.. ^ T . 11 ( antero-posterior 0.074 



Diameter distally \ . ^_„ 



^ (transverse 0.088 



Length of median metacarpal (slender) 0.240 



-p.. ^ „ . , -.(antero-posterior.., 0.057 



Diameter of proximal end \ ,, „ „„ 



( transverse 0.089 



Diameter of shaft (transverse) 0.049 



T^. ^ J. X 11 ( antero-posterior 0.041 



Diameter distally \ . .„_ 



•' ( transverse 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 Avas derived from 

 an inhospitable region rarely traversed by white men. The locality is 

 in the Painted Canyon not far from the Sierra Abajo in South-eastern 

 Utah, near the Colorado boundary ; lat. 38° 15' ; Ion. 110°. This canyon 

 is one of those tributary to the Great Colorado River, and is without water. 

 The rock is described by Prof. Newberry as the same as that which I 



