274 



TELE0ST0M1 



mesoblastic cells below the epidermis, and they remain at the 



Fig. 241. 



Skeleton of the right pectoral fin and right half of the pectoral girdle of Amia calva, I.., 

 seen from within, el, cleitliruni ; co, coracoid ; dr, lepidotrich ; /, nerve foramen ; •m.cu, meso- 

 coracoid arch ; vit, metapterygium ; p.cl, postclavicle ; p.t, post-temporal ; p.to, its lower process 

 to opisthotic ; rd, distal preaxial radial ; rp, proximal preaxial radial ; sc, scapula ; s.cl, supra- 

 clavicle ; s.f, scapular foramen. The cartilage is dotted. 



&— 



Left pectoral girdle of Acipenser sturio. A, obliiiue view from behind. B, inner view. 

 (From Gegeubaur, Vergl. Aunt.) d, cleithrum ; d', clavicle ; g, articular facets for pectoral 

 fin-skeleton ; o, u, open channel ; ss, dorsal cartilage. 



growing edge of the fin-web, sinking deeper into the connective 

 tissue, while the less numerous but more important lepidotrichia 



