477 



but its extent is still quite visible. Its form resembles that of man, 

 and it includes the surface for the insertion of the triceps muscle. 



The distal epiphysis is quite independent in both animals, and 

 forms the head and the styloid process (Fig. 7). 



The bones of the carpus, metacarpus, and digits are fully 

 formed. 



Innominate bone. As was to be expected from the age of 

 the animals, the ossific centres for the ilium, ischium, pubis, and 

 cotyloid bone are all blended. Only two epiphyses are distinguishable ; 

 and both of them are freely separable. The one for the crest of the 

 ilium is narrow, with its cephalic end slightly thicker than the caudal 

 (Fig. 8). The epiphysis for the tuberosity of the ischium includes 

 areas for the attachment of the biceps, semitendinosus, and semi- 

 membranosus muscles (Fig. 9). 



Fig. 8. Fig. 9. 



Fig. 8. Part of left ilium (lateral aspect) showing epiphysis for crest {cr.). c.l. 

 curved line. 



Fig. 9. Part of left ischium (ventral aspect) showing epiphysis for tuber {t.i.). 

 o.f. obturator foramen, s. symphysis. 



No ossific centres, such as those occurring in man, could be de- 

 tected in association with the symphysis. During his observations on 

 the development of the skeleton of the cat, Jatne i) also failed to 

 find any bony centres in this position, but expressed himself as hope- 

 ful that further study might bring them to light. 



If there has ever been as epiphysis in connection with the arti- 

 cular surface for the sacrum, all traces of it are hors lost. 



Femur. At the proximal end of the femur there are two epi- 

 physes separable, in both animals, from the shaft of the bone (Fig. 10). 

 The border of the epiphysis for the head follows the margin of the 



1) H. Jayne, Mammalian i^natomy. Part I. 

 Cat. London and Philadelphia 1898. 



The Skeleton of the 



