274 



TELEOSTOMI 



mesoblastic cells below the epidermis, and they remain at the 



fL 



Fio. 241. 



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

 seen from within, d, cleithrum ; eo, coracoid ; dr, lepidotrich ; /, nerve foramen ; m.co, meso- 

 coracoid arch ; mt, metapterygium ; p.d, postclavide ; 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./, scapular foramen. The cartilage is dotted. 



Fio. 242. 



Left pectoral girdle of Aeipenser sturio. A, oblique view from behind: B, inner view. 

 (From Qegenbaur, Vergl. Anat.) 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 



