188 Anvah of the South African Mnscuvi. 



485 mm., and it is only gently curved. The upper end is broad and 

 flat, and measures 205 mm. in width, and is 55 mm. thick. The top 

 of the scapula is antero-posteriorly slightly concave behind and 

 slightly convex in front. Transversely the whole top of the bone is 

 somewhat concave and rough, from which we may infer that there 

 was a large cartilaginous suprascapula. From the broad upper end 

 the bone gradually narrows down to near its middle, where it 

 measures only 87 mm. across and is' 45 mm. thick. Immediately 

 below the narrowest part it broadens out towards a fairly well- 

 developed acromion. Unfortunately tlie acromion process is 

 missing, and it is thus impossible to say how^ large it was, but, 

 judging from the curvature of the anterior margin of the bone, it is 

 possible that about 30 mm. is missing. In this case the width of 

 the bone at the acromion would be about 120 mm. About 40 mm. 

 below the middle of the l)one there is on the posterior edge a very 

 distinct muscular impression. The lower end of the scapula is made 

 up of a large and very deep glenoid portion, and a flat anterior 

 portion for articulation with the coracoid. The greatest antero-pos- 

 terior length of the lower end is 174 mm. The width of the glenoid 

 portion is 146 mm. Anterior to the articular end, and below the 

 acromion region the bone is markedly concave on its outer surface. 

 On the inner surface there is also a deep gi'oove in front of the 

 glenoid portion of the bone. Near the middle of the inner side 

 there is a large muscular impression. 



Compared with the scapula the coracoid is unusually small, and in 

 its proportions recalls that of Heriicto&uchus. Fortunately it is prac- 

 tically perfect, though, owing to its attachment to the scapula, the 

 inner side has not been fully displayed. It is irregularly semicircular 

 in shape, and the outer surface is moderately flat. About midway 

 between the anterior and posterior ends, and not far from the 

 glenoid border, there is a large rounded coracoid foramen. The 

 maximum length of the coracoid is about 185 mm., and the greatest 

 width 133 mm. The foramen is about 25 mm. in diameter. In 

 front the bone varies in thickness from 10 to 30 mm., but posteriorly 

 it gradually widens out towards the glenoid portion, where its maxi- 

 mum thickness is 115 mm. The inferior and posterior angle of the 

 bone is rough and excavated, and has evidently been covered by a 

 large piece of cartilage. The inner surface is deeply excavated. 

 There is no trace of a precoracoid. 



I am not aware that any shoulder girdle has been figured which 

 very closely resembles that of Erijthrosuchus. In BeJodon the scapula 

 is not unlike that of the African genus, but the bone is much ligliter 



