NORTH AMERICA AND THEIR VERTEBRATE FAUNA. 163 



deltoid crest almost disappears distally, but there is traceable a low, rounded 

 ridge extending obliquely across the anterior (upper) face of the bone to the 

 outer side of the distal end. A similar low, broad ridge rises from the dorsal 

 side of the inner edge of the proximal end and extends obliquely across the 

 shaft to the distal end, where it becomes stronger and forms the posterior 

 prominence of the widened face of the distal articular surface. The inner 

 edge of the bone is thin, but not so sharp as the outer edge ; it is short and 

 sharply turned outward on the large entepicondylar process. There is no 

 entepicondylar foramen, but there is a small ectepicondylar process. The 

 distal articular surface is rather narrow ; the radial condyle is very low and 

 almost entirely on the anterior face of the bone. 



This humerus resembles very closely the one figured by Williston as a 

 new genus, but not named, from the Craddock bone-bed (Bull. Geol. Soc. 

 Amer., vol. 21, pi. 15, figs. laand 16), but differs in its proportionately greater 

 breadth, stronger deltoid process, proportionately higher entepicondyle, less 

 roimded radial condyle, and the presence of a distinct ectepicondylar process. 

 Length of figured specimen, 91 mm. 



There are in the collection three rauch smaller humeri (No. 3420, fig. 

 36 c-f) very similar in form to the one just described, but with all the char- 

 acters less emphasized. These are probably from immature individuals of 

 the Cricotus. 



Femur. — The femur (Nos. 3366 and 3363, plate 22, figs. 6 and 7, and fig. 

 36, g, h) associated with bones of Cricotus is of a very simple type. The 

 proximal end agrees very closely with the portion preserved in the New 

 York specimen. The proximal articular face is semicircular and nearly flat, 

 except where it descends upon the process of the inner side. This process is 

 not distinct from the bone, being simply a more acute portion of the edge. 

 The bicipital fossa is relatively shallow. The outer edge of the bone becomes 

 very sharp just at the lower edge of the fossa and is continued as a sharp 

 ridge directly down the outer side of the bone to the lower end, where it 

 terminates upon the outer condyle. The section of the shaft is semicircular, 

 with the outer edge much sharper than the inner. The distal face is con- 

 fined to the end of the bone, looking almost directly distal. The face is 

 divided by a deep groove on the posterior face, but the two halves are con- 

 nected by a broad isthmus. An average specimen is 75 mm. long. 



Scapula (fig. 37, a, b, c). — Three imperfect scapula are of a form and size 

 which suggest that they may belong with this genus. Only the scapula is pre- 

 served, no trace of coracoids being found (Nos. 3421 and 3422). The blade is 

 short and curved, with a broad distal termination. The proximal end is dis- 

 proportionately widened and there is a very large cotylus. The supraglenoid 

 foramen is exceptionally large and pierces the supraglenoid fossa directly, as 

 in the Cotylosaurs and Ophiacodon; it is far larger proportionally than in any 

 known form from the Texas beds. The supracoracoid foramen is also very 

 large ; it opens anterior to the supraglenoid tuberosity and above the cotylus. 



