iv.] SKELETON OF UPPER LIMB. 157 



may, however, be very much elongated, as in the Chim- 

 panzee and Dolphin. 



The axillary border is, of course, drawn out where the sca- 

 pula is long and narrow. The most singular situation of this 

 border is found in the Echidna, where it appears as a slight 

 ridge traversing the outside of the blade of the scapula. 



The postero-superior angle of the scapula may be rounded 

 off, as in the Dog and many others. It may, on the other 

 hand, be very prominent, as in the Dolphin. The inferior 

 angle may also be either sharp or rounded. 



FIG. 132. RIGHT- SCAPULA AND CLAVICLE OF TWO-TOED SLOTH (C/iolarj>us 

 Hoffmanni). 



<T/J pre-scapular fossa ; pf, post-scapular fossa ; gc, glenoid cavity ; a, acromion ; 

 c, coracoid ; csf, coraco-scapular foramen ; cl, clavicle. 



(Frojn Flower's " Osteology") 



The neck of the scapula is always the narrowest part of 

 that bone in man's class, but when we descend we may find 

 it to be the widest part, as in some Fishes, e.g. Raia clavata. 



Passing now to the second part of the scapula, in man called 

 the coracoid process, we shall find that, rudimentary as is 

 this part in him compared with its condition in lower forms, 

 it is nevertheless not at its minimum, for it may be, as in 

 Ungulates, e.g. the Deer, quite rudimentary. On the other 

 hand, it may be relatively larger than in man, as in the Two- 



