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ANNALS NEW YORK ACADEMY OF SCIENCES 



Fig. 5.- — Pectoral girdle and fin of Ceratodus forsteri 



1, Left half of girdle, with fin : outer side seen somewhat from below, showing car- 

 tilaginous (stippled) and dermal elements ; 2, inner side ; 3, posterointernal view, show- 

 ing left coracoscapula and articular surface for pectoral fin ; 6, posterointernal view 

 after removal of coracoscapula ; 7, front outer view ; 4, rear view of left coracoscapula 

 cartilage; 5, outer side of same, with articular surface for cleithrum (cf. no. 1). 



Dermal elements: vv, clavicle; cl, cleithrum; s.cl, supracleithrum. 



Cartilaginous elements: co.sc, coracoscapula; m.v.c, median ventral cartilage; gl, ar- 

 ticular surface for "humerus"; H, "humerus" (proximal basal). 



pr.ax, preaxial or dorsal border ; po.ax, postaxial or ventral border. 



Unlike that of the Tetrapoda, the stout coracoscapula cartilage has a very short 

 ascending i*amus ; the glenoid region is widely protruded and the muscles are better 

 developed on the visceral or internal surface. 



