xxvi List of Illustrations 



PAGE 



Pteraspis rostrala 575 



Cephalaspis lyelli, Restored 576 



Cephalaspis dawsoni 577 



Pterichthyodes testudinarius 578 



Pterichthyodes testudinarius, Side View 579 



Birkenia elcgans 579 



Lasianius problemalicits 580 



Coccosteus cuspidatus, Restored 582 



Jaws of Dinichthys hertzeri 583 



Dinichthys intermedins, an Arthrodire 584 



Palceospondylus gunni J91 



Shoulder-girdle of Polyplenis bichir 600 



Arm of a Frog 601 



Polypterus congicus, a Crossopterygian Fish 602 



Basal Bone of Dorsal Fin, Holoptychius leptopteriis 603 



Gyroplychius microlepidotus 604 



Calacanihus elegans, showing Air-bladder 604 



Vndina gtilo 605 



Lower Jaw of Polypterus bichir, from Below 606 



Polypterus congicus 607 



Polypterus delhezi 607 



Erpetoiclithys calabaricus ' gog 



Shoulder -girdle of Neoceratodus jorsleri gog 



Phaneropleuron andersoni gj. 



Teeth of Ceratodus runcinatus gj . 



Neoceratodus jorsleri gj^ 



Archiptery'gium of Neoceratodus jorsleri gj . 



Upper Jaw of Neoceratodus jorsleri gjc 



Lower Jaw of Neoceratodus jorsleri g^g 



Adult Male of Lepidosiren paradoxa gj_ 



Lepidosiren paradoxa. Embryo Three Days before Hatching; Larva Thirteen 



Days after Hatching g^^ 



Larva of Lepidosiren paradoxa Forty Days after Hatching (,2^ 



Lan-a of Lepidosiren paradoxa Thirty Days after Hatching g2T 



Larv'a of Lepidosiren paradoxa Three Months after Hatching g2i 



Prolopterus dolloi g 



