LOWER LIAS. 13 



humeral articular process there is an oblong notch, with slightly raised borders. 

 The left scapula (Tab. Ill, 51) has yielded in two places to the external pressure, 

 but without separation of the broken parts. It gives the same indication of the 

 triangular muscular surface on the outside of its distal end as does the right scapula, 

 the apex being defined by a better preserved, slightly raised, obtuse border. The fore 

 part of the acromial end of the scapula («), though fractured like that on the 

 right side, is here better preserved, and gives a breadth of nearly G inches to this 

 end of the bone. The humeral articulation (a) measures 2 inches 6 lines, the 

 coracoid one ( c ) 4 inches. A small, oval, dermal bone (d), 1 inch 6 lines by 1 

 inch 3 lines, overlies the fore part of the scapulo-coracoid harmonia. It is 

 flattened, slightly convex externally, like some others that seem to have defended 

 the skin of the under surface of the trunk. 



The coracoid (ib., 52) is an almost circular, flattened, discoid bone, 5 inches in 

 antero-posterior diameter and 41 inches in transverse diameter ; the margin is 

 most modified where it is expanded in 2 inches of its extent to contribute the 

 coracoid portion (h ) of the humeral joint. The scapular articular border («) 

 presents less thickness. The mesial or sternal border (?«), continuing the circular 

 curve, touches its fellow (52') by only a small part of its circumference. The 

 average thickness of the coracoid plate is 7 lines. About 1 inch 3 lines from 

 the scapular surface there is a foramen, 5 lines in diameter. The free border 

 of the entire coracoid appears to be raised, but this is due to the included 

 surface having been crushed in and cracked by external pressure. 



In the hinder interspace of the coracoids there is a flattened mass of a rhoin- 

 boidal form, composed of scattered portions of thin, dark, osseous substance, 

 cemented together by matrix, which is discoloured by carbonaceous material. No 

 part shows the continuous, roughened, but compact, structure of the dermal bones. 

 It appears rather to be the remains of some partially ossified element of the endo- 

 skeleton. In its position it corresponds with the sternum. There is a fainter 

 trace of the same kind of material, or discoloration of the matrix, at the anterior 

 interspace of the coracoids. 



The humerus, which is preserved on the left side (Tab. Ill, 53) has been 

 singularly crushed and flattened ; the side of the middle of the shaft being 

 broken away, exposes a small medullary cavity. The distal end ( d) is 

 broken off, and slightly overlapped by the shaft (53). The length of the humerus 

 is 11 inches 3 lines. It presents a sigmoid flexure, the distal end slightly 

 bent downward or forward ; the proximal articulation, moderately convex, is 3 

 inches 8 lines in the long diameter ; the fore part is produced into a strong ridge, 

 here partly broken away. The distal end is 5 inches across, and is moderately 

 concave transversely behind. An osseous tubercle, 1 inch 4 lines by 10 lines, is 

 cemented to the anconal surface ; a second similar bone is attached to the inter- 



