270 C. H. HURST, PH.D. 



Of the furcula, a small portion is seen at the left shoulder of the 

 Berlin specimen. It was, however, imperfectly exposed at the time 

 when the photograph was taken. A larger portion is seen in the 

 London specimen. It is a characteristically avian furcula, U-shaped 

 ventrally, and articulating with the furcular tuberosity of the coracoid 

 at each shoulder. 



The humerus is a well-developed bone in each wing. Its form and 

 dimensions may be seen in Plates XIV. and XV. It differs from that 

 of other birds in being devoid of the pectoral crest or ridge for the 

 insertion of the great pectoral muscle. As Dames points out, this 

 confirms his view that the sternum must have been small, as must 

 also the great pectoral muscle. In Plate XIV. the proximal end of 

 the humerus is covered by a portion of the matrix, which has since 

 been removed (at 1 1 in Plate), and that plate consequently gives an 

 impression of a humerus which is slightly shorter than the true length. 



The bones of the fore-arm, seen in Plates XIV and XV, are a 

 straight radius 55 mm. long, and a curved ulna 56 mm. long. 



The carpus offers great difficulties. Owen figures two bones, one of 

 which is visible in the London specimen. Why he should ignore the 

 enormous ulnar carpal, which is a conspicuous object in the London 

 specimen, need not here be discussed. It is conspicuously shown in 

 Fig. 2 and in Plate I of Owen's memoir, where it is numbered 56' and 

 described (presumably with the radial carpal) as "left carpus" (it 

 being probably a part of the right carpus), and something wholly unlike 

 it is put in its place, in dotted lines, in his second plate (Fig. 2). 



Of these bones I have seen two clearly, one being the radiale (4 in 

 Plate XIV), which is visible in both the specimens, the other the 

 "ulnare," visible only in the London specimen. In the Berlin speci- 

 men the carpus lies radial side uppermost, and it is not surprising 

 that, like some other parts, the ulnar portion of the carpus lies still 

 embedded in the matrix. This is even admitted by Dames. The 

 little bone called "ulnare," and drawn from imagination by Owen, and 

 also drawn by Dames, may or may not be present. I have tried, and 

 failed, to make it out in the Berlin specimen, and I have also tried, 

 and failed, to make sure that it is not there. One thing only I can 

 say of it, viz., if present it is probably the intermedium, and not the 

 ulnare. The "ulnare" is the enormous and conspicuous bone shown 



