LIST OF ILLUSTRATIONS 



741. Amphioxus lanceolatus 45 



742. ,, ,, transverse sections of pharyngeal and in- 



testinal regions 46 



743. ,, ,, anatomy, diagrammatic .... 49 



744. ,, ,, transverse section of pharyngeal region, 



diagrammatic 50 



745. ,, ,, diagram of vascular system . ... . 51 



746. ,, ,, nephridium 53 



747. ,, ,, brain and cerebral nerves .... 54 



748. ,, ,, anterior portion of neuron ... 55 



749. ,, ,, segmentation of the oosperm ... 56 



750. ,, ,, formation of gastrula 57 



751. ,, ,, development of notochord, neuron, and 



mesoderm .58 



752. ,, ,, advanced embryo 59 



753. ,, ,, young larva 60 



754. ,, ,, more advanced larva 62 



755. ,, ,, development of atrium .... 63 



756. ,, ,, ,, ,, transverse sections 64 



757. Ideal Craniate 68 



758. Section of skin of Fish 69 



759. Muscular system of Dogfish 70 



760. Ideal Craniate, anatomy 71 



761. Vertebral column of embryo, transverse section .... 73 



762. Diagram illustrating segmentation of vertebral column ... 74 



763. Elements of embryonic cranium 75 



764. Diagrams of cartilaginous skull . . .77 



765. Diagrams of bony skull 80 



766. Development of pelvic fins, diagram 82 



767 and 768. Diagrams of limbs and limb-girdles 83 



769. Structure and development of tooth 86 



770. Structure of liver, diagrammatic 87 



771. Diagram of gills 89 



772. Diagram of vascular system of Fish 91 



773. Diagram of circulation in a Fish 93 



774. Diagram of vascular system of embryo of air-breathing Craniate . 95 



775. Diagram of heart of Amphibian and Crocodile . . .96 



776. Blood-corpuscles of Frog and Man 97 



777. Transverse section of spinal cord . . . . , . . .99 



778. Diagrams of Craniate brain 101 



779. Diagram of cerebral and anterior spinal nerves .... 104 



780. Organs of touch 107 



781. Sensory canals of head and organs of the lateral line . . . 108 



782. Taste-buds 109 



783. Olfactory cells 109 



784. Section of eye 110 



785. Diagram of retina Ill 



786. Development of eye 112 



