_Polyrhizodus radicans._ 555 _Dasyatis sabina_, Sting-ray. 556 _Aëtobatis narinari_, Eagle-ray. 558 _Manta birostris_, Devil-ray or Sea-devil. 559 Skeleton of _Chimæra monstrosa_. 564 _Chimæra colliei_, Elephant-fish. 565 _Odontotodus schrencki_, Ventral Side. 570 _Odontotodus schrencki_, Dorsal Side. 570 Head of _Odontotodus schrencki_, from the Side. 571 _Limulus polyphemus_, Horseshoe Crab. 572 _Lanarkia spinosa._ 574 _Drepanaspis gmundenensis._ 575 _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 _Palæospondylus 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 _Coelacanthus 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 forsteri_. 615