398 CHORDATA. 
or metacromion. The anterior or coracoid border of the 
scapula is continuous with a coracoid process projecting 
inwards. It represents a vestigial portion of the precoracoid 
bone. 
The humerus has a 
Fig. 289.—Dorsat Virw or Lert large ead and _ two 
MANus oF Rappir. (Ad nat.) prominent  /uderosities. 
(Slightly magnified). Distally it moves in the 
z trochlea or articular sur- 
face of the fore-arm, 
above which is a small 
supratrochlear foramen. 
The radius and ulna 
are distinct but closely 
united to allow of no 
pronation. The fore- 
limb is permanently 
supinated. The ulna is 
produced back beyond 
the radius to form the 
olecranon process. 
The carpal bones are 
nine, Closely bound to- 
gether by ligament. The 
proximal carpals consist 
of scaphoid, lunare and 
cuneiform, and a small 
sesamoid (pisiform), 
together with a small 
centrale. ‘The distal 
carpals are the ¢vapezzum, 
trapesoid, magnum and 
unciform. 
There are five meta- 
carpals, each bearing a 
digit. The first digit has two phalanges and the others 
three. 
The pelvic girdle has large za which run dackwards to 
the acetabulum. The pubes are united ventrally to the 
tschia, thus enclosing on each side a large obturator foramen. 
The symphysis is pubic only. 
Os 
Magnum. 
Unciform. 
Cuneiform. 
Ulna. 
