xxvi List of Illustrations 



PAGE 



Pteraspis rostrata 575 



Cephalaspis lyelli, Restored 576 



Cephalaspis dawsoni 577 



Pterichthyodes testudinarius ." 578 



Pterichthyodes testudinarius, Side View 579 



Birkenia elegans 579 



Lasianius problematicus 580 



Coccosteus cuspidatus, Restored 582 



Jaws of Dinichthys hertzeri 583 



Dinichthys intermedius, an Arthrodire 584 



Palceospondylus gunni 591 



Shoulder -girdle of Polypterus bichir 600 



Arm of a Frog 601 



Polypterus congicus, a Crossopterygian Fish 602 



Basal Bone of Dorsal Fin, Holoptychius leptopterus 603 



Gyroptychius microlepidotus 604 



Ccdacanthus elegans, showing Air-bladder 604 



Undina gulo 605 



Lower Jaw of Polypterus bichir, from Below 606 



Polypterus congicus 607 



Polypterus delhezi 607 



Erpetoichthys calabaricus 608 



Shoulder-girdle of Neoceratodus forsteri 609 



Phaneropleuron andersoni 613 



Teeth of Ceratodus runcinatus 614 



Neoceratodus forsteri 614 



Archipterygium of Neoceratodus forsteri 614 



Upper Jaw of Neoceratodus forsten 615 



Lower Jaw of Neoceratodus forsteri 616 



Adult Male of Lepidosiren paradoxa 619 



Lepidosiren paradoxa. Embryo Three Days before Hatching; Larva Thirteen 



Days after Hatching 620 



Larva of Lepidosiren paradoxa Forty Days after Hatching 621 



Larva of Lepidosiren paradoxa Thirty Days after Hatching 621 



Larva of Lepidosiren paradoxa Three Months after Hatching 621 



Protopterus dolloi 622 



