274 



TELEOSTOMI 



mesoblastic cells below the epidermis, and they remain at the 



.-scl. 



pel. 



FIG. 241. 



Skeleton of the right, pectoral flu and right half of the pectoral girdle of Amia calm, L., 

 seen from within, rf, cleithrum ; co, coracoid ; dr, lepidotrich ; /, nerve foramen ; m.co, ineso- 

 coracoid arch ; mt, 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.d, supra- 

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



FIG. L'4-J. 



Left pectoral girdle of Atipenser sturlo. A, oblique view from behind. B, inner view. 

 (From Gegenbaur, Vergl. Anat.) cl, cleithrum; d', clavicle ; g, articular facets for pectoral 

 fin-skeleton ; o, , 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 



