354 



Annals of the South African Museum. 



and distal ends. The width of the distal end is 43 mm., of the 

 proximal end 40 mm., while the narrowest part of the shaft - 

 which occurs just above the proximal expansion measures but 

 15 mm. in width. There is no acromion process. 



The bone figured and described in the original paper as a clavicle 

 is in reality a coracoid. The left coracoid is perfect save for the 

 extreme distal point. The coracoid is a long, thin bone, whose shape 

 can best be understood from the figure. The ventral margin is 

 slightly convex and thin. Above this thin border the bone swells 



Fig. 15. Sphenosuchus acutus, Htn. 

 Inner view of left coracoid. x 1. 



and on the outer side there is a very slightly roughened elongated 

 surface apparently for the insertion of the coraco-brachialis muscle. 

 Above the interclavicular portion the anterior border is concave to 

 a point directly below the coracoid notch, and then is again some- 

 what concave, the two curves being separated by a well-defined 

 obtuse angle. The upper border of the post-glenoid prolongation is 

 slightly concave. Anterior to what is apparently the scapular arti- 

 cular surface there is a small coracoid notch measuring only 2'5 mm. 

 in diameter, and beyond this is a thin spatulate pre-glenoid prolon- 

 gation with a length along its upper border of 11 mm. The greatest 

 length of the bone is 77 mm. The width at the coracoid notch is 

 13 mm. ; that at the broadest part of the postglenoid prolongation 



