Fi'.. "o. PECTORAL ARCH OF VARIOUS AMPHIBIANS. From the ventral side. 

 A Urodele (diagrammatic) ; B Axolotl (AmUystoma) ; C Bomhinator 

 iynem ; D, Raiia es'-uhnt'i.. 



C, coracoid ; Cl, procoracoid ; Cl 1 (Cl in D), clavicle; EC, Co 1 , epicoracoid ; 

 EI>, oniosternum ; Fe, fenestra between procoracoid and coracoid bars ; Kn, 

 cartilaginous xiphisternum ; t, Pf, G, glenoid cavity for the humerus ; 

 8, scapula ; SS, suprascapula ; St, St l , sternum. *, f (i Q B) indicate nerve- 

 apertures. 



