(3o6) 



Fig. 179. Transformation of crossopterygian pectoral girdle and fin into 

 pentadactyle limb. Oblique front view of left side. 



a, *Eusthenopteron\ b, *Eogyrinus; c, *Eryops; clt. cleithrum; civ. clavicle; 



h. humerus; p. pubis; sc. scapula; s.cl. supracleichrum. (Modified from 



Gregory and Raven, Ann. N.Y. Acad. Sci. 42.) 





Fig. 180. Transformation of crossopterygian pelvic fin into tetrapod limb. 



a, *Eusthenopteron; B, hypothetical; c, *Trematops. f. femur; fi. fibula; il. ilium; 

 is. ischium; t. tibia. (Modified from Gregory and Raven.) 



