of the Genus Stenomylus. 



311 



concave curve. The high spinous crest divides the blade into 

 a smaller prescapular and a larger postscapnlar fossa, the latter 

 being bounded on the outside by a raised ridge running along 

 the posterior margin. Along the upper edge, the spine of the 

 scapula is thickened and rugose for muscular attachments. 

 Proximally it extends forward, making a slender acromian 



Fig. 14. 



Pig. 14. Stenomylus hitchcocki, scapula seen from the dorsal side, x 1/2. 



process which does not extend quite to the level of the glenoid 

 fossa. The coracoid process is of but moderate dimensions and 

 rolled inward, making a hook-like process. The shallow 

 glenoid fossa is wider than high in the ratio of 4 to 3. 



The humerus is slender and moderately long, the shaft hav- 

 ing a well-marked sigmoid curvature. Corresponding to the 

 shallow glenoid, the sessile head is but moderately convex. 

 The greater tuberosity spreads along fully half of the width of 

 the head, rising high above it, and overhanging the narrow 

 bicipital groove ; while the low lesser tuberosity of only half 

 the width of its neighbor bounds the groove on the inner side. 

 The bicipital groove when viewed from the front is seen to lie 



Fig. 15. 



Fig. 15. Stenomylus hitchcocki, 

 xl/2. 



humerus, seen from the dorsal side. 



just to the inner side of the median line ; and while narrow at 

 the bottom, it expands up onto the lesser tuberosity, so that its 

 width is about equal to that of the tuberosity. There is no 

 trace of the bicipital tubercle dividing the groove into two 



