THE CARTILAGINOUS SKELETON 



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however, interesting to observe that digits 2 and 3 make their appearance first in the 

 fore-Hmb, and in the hind-hmb digits 3 and 4. Moreover in the latter, the digits have 



Fig. 7. The cartilaginous skeleton, cartilages shown black, a, stage 22 ; b, stage 26; c, stage 31 ; e, stage 34; 

 d, pelvic girdle, stage 31. Scale: ■; 5. 



each two cartilages at this stage and metatarsals 2, 3, and 4 are quite well developed. In 

 the fore-limb metacarpals 2 and 3 may be identified. 



