390 Annals of the South African Museum^ 



Shoulder Girdle. Both scapulae are preserved, but are somewhat 

 incomplete at the distal end and each lacks the end of the supra- 

 coracoidal wing. The proximal end is very similar to that of the 

 smaller scapula assigned by von Huene to Massosjtondi/lus carinatus. 

 The glenoid cavity is the same size, the posterior half of the articular 

 surface for the coracoid slightly larger and the shaft of the bone a 

 little broader. The distal end expands fairly considerably, but not 

 so much as in Sphenosuchus acutus. 



The chief measurements are: 



Probable greatest length . . . 280 mm. 



Greatest width 104 mm. 



Minimum width of shaft ... 40 mm. 



( Ireatest thickness at articulation with 



coracoid . . 30 mm. (left) 43 mm. (right) 



The left coracoid is almost entire, the right one represented by 

 the posterior half. The inner surface is concave, the outer slightly 

 convex except for a strong thickening in 'the middle of the lower 

 portion of the bone. This thickening takes the form of a strong 

 short longitudinal swelling which rapidly subsides into the bone at 

 its upper and lower ends. This thickening is for the reception of 

 the coraco-brachialis muscle, according to von Huene. In front of 

 the coracoidal portion of the glenoid cavity the border is concave 

 to the anterior ventral angle. The anterior border is regularly curved. 

 The left coracoid is 13.") mm. broad, 80 mm. high, and has a maximum 

 thickness at the scapular surface of 30 mm. 



Attached to the upper portion of the anterior border of the left 

 coracoid is a small piece of bone lying generally in a plane at right 

 angles to that of the coracoid and bent in a convex manner when 

 viewed from in front. In collecting the shoulder girdle a number 

 of pieces of thin bone were found in situ in the region of the two 

 coracoids. These have been litted together as much as possible and 

 seem to give indisputable evidence of the presence of two clavicles 

 and an interclavicle. These bones are too fragmentary to permit of 

 full description. The largest fragment is a piece which I take to 

 be the interclavicle. As preserved it is 86 mm. long. The bone is 

 a thin plate broadening somewhat posteriorly, and possibly anteriorly, 

 slightly convex from side to side ventrally save in the anterior portion 

 where there is a prominent longitudinal swelling for the attachment 

 of muscles, similar in form to that on the coracoids. The dorsal 

 surface is flat, so that the edges of the bone are thin. Lying at the 



