49 6 



MANUAL OF ZOOLOGY 



SECT. 



than in the Pigeon. There is a broad thin triangular 

 scapula, the base or vertebral edge of which has a thin 

 strip of cartilage (the supra-scapular cartilage) continuous 

 with it. Along the outer surface runs a ridge the spine ; 

 the spine ends below in a long process the acromion process 

 (a.) from which a branch process or metacromion (ma.) is 

 given off behind. At the narrow lower end of the scapula 

 e is a concave surface 



the glenoid cavity 

 into which the 

 head of the humerus 

 fits, and immediately 

 in front of this is a 

 small inwardly curved 

 process the coracoid 

 process (c.) which is 

 represented by two 

 separate ossifications 

 in the young Rabbit. 

 A slender rod the 

 clavicle (cl.) is con- 

 nected with the cora- 

 coid process extern- 

 ally and with the sternum internally by means of fibrous 

 tissue. 



At the proximal end of the humerus are to be recognised : 

 (i) A rounded head for articulation with the glenoid cavity 

 of the scapula ; (2) externally a greater and (3) internally a 

 lesser tuberosity for the insertion of muscles. At the distal 

 end are two articular surfaces, one (trochlea) large and pulley- 

 like, for the ulna; the other (capitelhini) smaller, for the 

 radius : laterally are two prominences or condyles, an 

 internal and an external. 



FIG. 278.- Lepus cuniculus. Shoulder-girdle 

 with anterior end of sternum of young speci- 

 men, a. acromion ; of. pre-scapular fossa ; 

 c. coracoid process ; cl. ossified clavicle ; ma. 

 meta-cromion ; mss. meso-scapular segment ; 

 ost. pre-sternum ; pc. pre-coracoid ; pf. post- 

 scapular fossa ; ps. presternum ; sr. sternal ribs. 

 (After Flower.) 



