177 



this is articulated to, and carries, a single phalanx, which is fused 

 with the long claw (cj. Still more to the ulnar side of the scapho- 

 carpal, articulating with it and projecting beyond it towards the 

 ulnar side, is a bone (t) very wide in a radio-ulnar direction, which 

 seems a greatly widened metacarpal, for it is articulated to, and 

 carries, the large triangular claw of the fourth digit (d). 



If, therefore, I am correct in these homologies, each of the third 

 and fourth digits possess one phalanx only, with which is firmly 

 fused the corresponding great claw. 



Articulating with that described as the cuneiform is an 

 elongated bone, pointing superiorly, which appears to be an elon- 

 gated pisiform (fig. 5 />). Parallel to this, and lying so much ta 

 its dorsal side that it is partially concealed by the pisiform in the 

 palmar view represented in the figure, is an elongated metacarpal- 

 like bone (fig. 5 u), which, by its proximal extremity, articulates 

 with the scaj)ho-carpal. This I take to be the metacarpal of the 

 fifth digit, and it together with the pisiform support at their distal 

 extremities a broad stumpy nail (e). 



Lying on the palmar surface of the manus is a considerable 

 bone before alluded to, which appears to be a palmar sesamoid. 

 As has been stated, it is not shown in position, for it would have 

 obscured other parts, but it is represented separately, with its 

 palmar aspect turned towards the observer (fig. 5a). By its forked 

 distal extremity it articulates with two facets on the large claw- 

 bearing phalanges representing the third and fourth digits. These 

 are marked y.y in fig. 5, and if, in the sketch, they appear 

 too wide apart to correspond with the forks of the sesamoid bone, 

 it is because the two digits have been somewhat separated to allow 

 of better representation. By the proximal extremity this sesa- 

 moid articulates with a surface having three facets (x.x.x), two of 

 which are furnished by the scapho-carpal, and one by the pisi- 

 form. From its position it forms a sort of buttress or prop for 

 the third and fourth digits, and in the same way the pisiform 

 forms a support for the fifth. 



THE PELVIC GIRDLE. 



• (PI. IX., figs. 1, 2, 3 and 4.) 



The pelvis lies very obliquely, nearly approximating to the 

 horizontal. There is no indication of separation between its 

 constituent bones. 



The ilium is rod-like and trihedral in its middle part, with its 

 faces looking downwards and outwards, downwards and inwards, 

 and nearly directly upwards respectively. Anteriorly these sur- 

 faces gradually widen, and eventually the bone fuses with the body, 

 metapophysial and transverse processes of the first, with the body 

 and transverse process of the second, and with the transverse 



