Text Figures 



Page 



Rhinoceros skulls 307 



Pattern of skull-top of- Devonian dipnoans 323 



Skull pattern of Osteolepis microlepidotus 330 



Skull patterns of T rimer orliachis and Diplopterus 336 



Pectoral girdle of Acipenser and Amia 347 



Pectoral girdle and fin of Ceratodus forsteri ^. . 352 



Pectoral girdle of Polyterus bichir 354 



Restoration of Megalichthys. After E. D. Wellburn 356 



Right pectoral limb of Eusthenopteron foordi. After Patten 359 



Right pectoral limb of Sauripterus taylori — Restoration, medial aspect. . . 360 



Head and pectoral limb of Osteolepis microlepidotus 361 



Comparison of the paired limbs of Palaeozoic rhizodonts and tetrapods . . . 363 



Homology of the coracoid in primitive mammals 370 



Homology of the coracoids in Monotremes 371 



Homologies of the coracoids, etc., in reptiles 372 



Homologies of the coracoids, etc., in Amphibia 374 



VI 



