797 



to this surface is more produced, as is also that between the surface for the scaphoid and that 

 for the thumb. The os magnum has the surface for the middle metacarpal much more pro- 

 duced in the antero-posterior direction, and the undulations are more marked. The surface 

 has a small notch on each side the middle part. The unciform process of the os unciforme 

 is much thicker and more produced, and the articular surface is continued upon it, which 

 makes it more concave. The articular surfaces do not entirely surround the rough flattened 

 base of the bone as in Man, but are interrupted by a rough tract continued from that base to 

 the unciform process. 



The metacarpal of the thumb is a little longer than in Man, but not quite so broad : the 

 proximal trochlea is more concave vertically and more convex transversely, -and the distal 

 surface is more convex. The proximal phalanx is one-fifth longer, and is more slender than 

 in Man. 



The metacarpals of the other fingers are more than one-third larger and longer than in 

 Man, their shaft is more bent ; the tuberosities beneath the proximal articular surfaces are 

 better developed : the articular surface on the outer side of the base of the second meta- 

 carpal is divided by a rough groove which only indents it in Man : the distal convexities are 

 relatively larger. The proximal phalanges of these fingers differ not only in their greatly 

 superior size, but in the deep excavation of their under or anterior surface, which is bounded 

 by rough lateral ridges ; they are also more flattened and rather more bent. The distal pha- 

 langes of the anterior extremity are longer, more slender, and less expanded at their rough 

 terminations. 



Each os innominatum is one foot three inches in length, that of Man being seven inches 

 and a half : the breadth of the ilium is eight inches and a half, that of Man being six inches. 

 The ilium is less concave, of a more triangular figure, the anterior border being much longer 

 and straighter. The superior labrum of the ilium describes a more regular convex curve, and 

 does not present any partial thickening near its middle as in Man. The more elongated and 

 narrower form of the sacral surface corresponds with what has been noticed in the sacrum : 

 the posterior angle or spine of the ilium is above that surface, not behind it as in Man : the 

 distance between the antero-superior and antero-inferior spine is much greater in the Gorilla : 

 the antero-inferior spine is situated, as in Man, just above the acetabulum. The upper 

 ischiatic notch is much less deep than in Man, and there is a very feeble rudiment of the 

 tuberositv dividing it from the lower notch. The acetabulum resembles in form and is not 

 much larger than that of Man : the obturator foramen presents a more regular oval form than 

 in Man, and its long axis inclines from above downwards and inwards instead of downwards 

 and backwards as in Man : the upper border is not impressed by the oblique groove for the 

 obturator nerve and vessels as in Man. With regard to the ischium, its most characteristic 

 distinction hi the Gorilla is seen in its great extent below the acetabulum where it forms a 

 strong subtrihedral column, terminating below in the rough flattened tuberosity, the aspect of 

 which is wholly downwards, not backwards as in Man : the united plates of the ischium and 

 pubes, bounding the obturator foramen internally, are considerably broader than in Man. 

 The plane of the ilium is twisted almost at right angles with that of the ischium and pubes 

 in the Gorilla. 



The femur is shorter than in Man, and much shorter in proportion to the breadth of the 



