33o THE CORRESPONDENCE BETWEEN THE [chap, 



A 



Fig. T25. — Diagrammatic representation of the positions of the limbs of Mammalia. 

 The preaxial border is left light, the postaxial border shaded, in all the figures. 

 Limbs of the right side are represented in all cases. A dorsal aspect of the 

 anterior extremity in its primitive unmodified position; £-/> glenoid border of the 

 scapula ; s spine ; cb coracoid border ; ssf subscapular fossa ; pf postscapular (in- 

 fraspinal) fossa ; c coracoid : h humerus; gt greater, radial, or pteaxial tuberosity; 

 It lesser, ulnar, or postaxial tuberosity; ec external (in the modified position , 

 radial, or preaxial condyle; ic internal, ulnar, or postaxial condyle ; r radius, 

 u ulna ; 1 pollex ; v fifth digit. B dorsal aspect of the posterior extremity in the 

 same position ; ab acetabular border of the ilium ; fb pubic border ; ib ischial 

 border ; gs gluteal surface : is iliac surface ; * ischium ; p pubis ; f femur ; It lesser, 

 tibial, or preaxial trochanter ; gt greater, fibular, or postaxial trochanter; ic in- 

 ternal (in the modified position), tibial, or preaxial condyle ; ec external, fibular, 

 or postaxial condyle ; t tibia ; f fibula ; 1 hallux; v fifth digit; c the anterior 

 extremity, wiih the humerus in the same position, but the eibow- and wrist -joints 

 bent ; d the posterior extremity in the same position. 



" internal/'* and the lesser trochanter. All these parts, then, 

 should be regarded as serially homologous. 



