(H8 WTLLIAM K. SMELL IE ON 



smooth concave part of the margin and terminate in the strong outwardly 

 directed tubercle. 



The posterior bar of the scapula is triangular in section, and terminates in two 

 faces making an angle with each other distinctly greater than a right angle. The 

 one face, the glenoid surface (gl.), forms half an ellipse, is comparatively smooth and 

 gently concave ; it measures 5'5 cm. by G cm., the line of junction with the coracoid 

 being the smaller. The other face, the surface of union with the coracoid, is a 

 triangle 8 cm. high and almost right-angled in the outer (ventral) angle. This 

 surface and the corresponding one on the coracoid are very rough, but there has 

 been no extensive symphysis, for, in places, the separation of the bones has left 

 pieces of the one adhering to the other, indicating a close union and at least partial 

 fusion during life. About 3 cm. from the glenoid surface the lower border rises into 

 a rough ridge which runs in a straight line towards the anterior extremity of the 

 scapula, but flattens out before it passes the well-marked tubercle on the anterior 

 lateral border. Between this ridge and the similar one on the dorsal ramus there is 

 a well-marked angular hollow. The inner edge of the posterior bar of the scapula is 

 thin and sharp ; it forms the outer border of the coraco-scapular opening. 



The ventral ramus (v.sc.) is partly covered on its inner (visceral) side by the 

 clavicle (cl.), and the covered part shows a sudden and appreciable reduction in 

 thickness. The anterior lateral border is composed of two concavities separated by 

 the prominent tubercle referred to above. The border approaches the median line 

 at an angle of 45 degrees, but, when it is about 3 "5 cm. distant from the median line, it 

 turns abruptly inwards and the extreme anterior portion bends up protectively in front 

 of the clavicle and has a roughened unfinished edge as if the bone had a cartilaginous 

 continuation in life. The median border of the scapula is fused to that of its fellow, 

 and, as they have met after making a sharp bend downwards, a strong median ridge 

 lias resulted. The posterior prolongation of the united scapulae passes imperceptibly 

 into the anterior prolongation of the fused coracoids. The bones have been separated 

 by fracture, and there is no trace of symphysis or suture to indicate that they were 

 separated in life. The median ridge above mentioned continues into the cora- 

 coids, and only flattens out when crossing a line joining the outer angles of the 

 glenoids. This ridge is very rough, and at its highest part finishes with a concave 

 roughened tip indicating a cartilaginous termination. The ventro-dorsal depth of 

 this bar is 7'5 cm., while its diameter between the coraco-scapular fenestra is only 

 I '8 cm. A section through the corresponding part of Cvyptoclcidus is nearly 

 circular. The inner (visceral) side of the ventral rami (v.sc.) shows considerable 

 thickening between the anterior ends of the coraco-scapular foramina, but forward 

 from this the median line is occupied by a hollow corresponding to the ridge on the 

 under side. 



Only the right clavicle (text-fig. 7, A, cl.) is present. It lies very closely on the 

 inner surface of the scapula, and does not protrude beyond the border of the scapula 



