x LIST OF ILLUSTRATIONS 



FIG. PAGE 



749. Salpa, late stage in development 40 



750. Amphioxus lanceolatus 43 



751. ,, transverse sections of pharyngeal and in- 



testinal regions ...... 44 



752. ,, ,, anatomy, diagrammatic .... 47 



753. ,, ,, transverse section of pharyngeal region, 



diagrammatic ..... .48 



754. ,, ,. diagram of vascular system . . . . 49 



755. ,, ,, nephridium 51 



756. ,, ,, brain and cerebral nerves .... 52 



757. ,, ,, anterior portion of neuron .... 53 



758. ,, ,. segmentation of the oosperm ... 54 



759. ., ,, formation of gastrula 55 



760. ,, ,, development of notochord, neuron, and 



mesoderm ....... 56 



761. ,, ,. advanced embryo ...... 57 



762. ,, .. young larva ....... 59 



763. ., ,, more advanced larva ..... 60 



764. ,, .. development of atrium 61 



765. ,, ,, ,, ,, transverse sections 62 



766. Ideal Craniate ... . . . 66 



767. Section of skin of Fish . 67 



768. Muscular system of Dogfish 68 



769. Ideal Craniate, anatomy 69 



770. Vertebral column of embryo, transverse section. .... 70 



771. Diagram illustrating segmentation of vertebral column ... 71 



772. Elements of embryonic cranium 73 



773. Diagrams of cartilaginous skull 74 



774. .Diagrams of bony skull 77 



775. Development of pelvic fins, diagram . . .... 79 



776 and 777. Diagrams of limbs and limb-girdles 80 



778. Structure and development of tooth 83 



779. Structure of liver, diagrammatic ...... .85 



780. Diagram of gills .86 



781. Diagram of vascular system of Fish 88 



782. Diagram of circulation in a Fish 89 



783. Diagram of vascular system of embryo of air-breathing Craniate . 92 



784. Diagram of heart of Amphibian and Crocodile 93 



785. Blood-corpuscles of Frog and Man 94 



786. Transverse section of spinal cord ........ 95 



787. Diagrams of Craniate brain 98 



788. Diagram of cerebral and anterior spinal nerves . . . . . 101 



789. Organs of touch .103 



790. Sensory canals of head and organs of the lateral line . . . 104 



791. Taste-buds . 105 



792. Olfactory cells ... 106 



793. Section of eye 106 



794. Diagram of retina 107 



