LIST OF ILLUSTRATIONS 



697. Aruphioxus lanceolatus, transverse sections of pharyiigeal and in- 



testinal regions 40 



698. ,, ,, anatomy, diagrammatic 43 



699. ,, ,, transverse section of pharyiigeal region, 



diagrammatic ... 44 



700. ,, ,, diagram of vascular system .... 45 



701. ,, ,, nephridium 47 



702. ,, ,, brain and cerebral nerves .... 48 



703. ,, ,, anterior portion of neuron .... 49 



704. ,, ,, segmentation of the oosperm . . 50 



705. ,, ,, formation of gastrula 51 



706. ,, ,, development of notochord, neuron, and 



mesoderm . . . . . . .52 



707- ,, ,, advanced embryo 53 



708. ,, ,, young larva . . _ . . 54 



709. ,, ,, more advanced larva . . . . . 55 



710. ,, ,, development of atrium 56 



711. ,, ,, ,, ,, transverse sections. 57 



712. Ideal Craniate 61 



713. Section of skin of Fish 62 



714. Muscular system of Dogfish ... 63 



715. Ideal Craniate, anatomy . . . . .65 



716. Vertebral column of embryo, transverse section .... 66 



717. Diagram illustrating segmentation of vertebral column ... 67 



718. Elements of embryonic cranium 68 



719. Diagrams of cartilaginous skull . .70 



720. Diagrams of bony skull 73 



721. Development of pelvic fins, diagram . . . . . . .75 



722. Diagrams of limbs and limb-girdles 76 



723. Transverse section of intestine 79 



724. Structure and development of tooth 80 



725. Structure of liver, diagrammatic 81 



726. Diagram of gills 83 



727. Diagram of vascular system of Fish 85 



728. Diagram of circulation in a Fish 88 



729. Diagram of vascular system of embryo of air-breathing Vertebrate 89 



730. Diagram of heart of Amphibian and Crocodile 90 



731. Blood corpuscles of Frog and Man . 91 



732. Transverse section of spinal cord 93 



733. Diagrams of Craniate brain .95 



734. Diagram of cerebral and anterior spinal nerves 98 



735. Organs of touch . . . 101 



736. Organs of the lateral line 102 



737. Taste-buds 103 



738. Olfactory cells 103 



739. Section of eye . .104 



740. Diagram of retina . . . . . 105 



741. Development of eye . . .106 



