254 



THE PIGEON 



(d) The radiale and ulnare, the two proximal carpal bones of the wrist. 



(e) The carpo-metacarpus, a compound bone formed by the fusion of the 



three distal carpals and the three metacarpals. It bears the first 

 digit with a single phalanx, the second digit with two phalanges, and 

 the third digit with one small phalanx. 

 Draw the complete fore-limb and as much as possible of the pectoral girdle. 



Deltoid 

 ridge' 



,'.§' /~ Pneumatic 

 foramen 



--Humerus 



Olecranon 

 process 



3rd Metacarpal 



1st Phalanx 

 of 2nd Digit --^ 

 2nd Phalanx' , 

 of 2nd Digit— 



Fig. 89. — The Fore-limb of the Pigeon {Colvmba). 



3. The Pelvic or Hip Girdle. 



Each side of the pelvic girdle consists of the following parts : — 



(a) The Uium, a very large bone, fused along its inner border with the whole 



of the sacrum. It is divisible into pre-acetabular and post-acetabular 

 portions of nearly equal size. It provides the dorsal portion of the 

 acetabulirai, and on the posterior edge of that socket it is produced 

 into a process, the antitrochanter, an articular facet for the great 

 trochanter, a process of the femur. 



(b) The ischium, which is posterior to the ilium, and triangular in shape. 



