ill 



FIG. 43. PECTORAL ARCH OF VARIOUS AMPHIBIANS. (From the ventral side). A Urodele 

 (diagrammatic) ; B Axolotl ; C Bombinator igneus ; D Rana esculenta, 



SS, suprascapula ; S, scapula; Cl, procoracoid; Cl l (Cl in D], clavicle ; C, coracoid EC, 

 Co 1 , epicoracoid; t, Pf, G, glenoid cavity for the humerus ; St, St l , sternum; Ep, 

 omosternum ; Fe, fenestra between procoracoid and coracoid bars. * and t in B indicate 

 nerve-apertures. 



