PLATE 10 



EXPLANATION OF FIGURES 



37 Petrogale xanthopus, 3 inches long. Right scapula, outer view; sternum, 

 inner view. After Parker. 



38 Mus musculus, adult, inner view. Anterior end of sternum and medial 

 end of clavicles, showing omosterna, and epicoracoids. After Parker. 



39 Shoulder-girdle seen in a reconstruction of Dasyurus viverrinus. Front 

 view of mammary fetus. 



40 Sternum of adult Manatus americanus. Left half, inner view. After 

 Parker. 



41 Sternum of the embryo of the Dolphin. Inner view. After Parker. 

 Ac, acromian PST, presternum 



CI, clavicle R 1 , first rib 



Cr, coracoid R 2 , second rib 



ECr, epicoracoid R 3 , third rib 



F, fontanelle R s , eighth rib 



Gl, glenoid Sc, scapula 



MSt, mesosternum SSc, suprascapula 



OSt, omosternum XSt, xiphisternum 



110 



