LIST OF ILLUSTRATIONS xi 



FIG. PAGK 



787. A. Muscles and nerves of eye 113 



787. B. Pineal eye of Sphenodon 114 



788. Organ of hearing 115 



789. Section of Ampulla 116 



790. Urinary tubule 117 



791. Diagrams of urinogenital organs 119 



792. Development of mesoderm in Frog 121 



793. Petroinyzon marinus, external views of head 124 



794. ,, ,, skull, with branchial basket . . . .126 



795. 127 



796. ,, ,, dissection of female 129 



797. ,, ,, brain 131 



798. ,, ,, ,, with olfactory and pituitary sacs . 132 



799. ,, ,, development of olfactory and pituitary sacs 133 



800. ,, ,, auditory organ 134 



801. ,, ,, transverse section of abdomen . . . 134 



802. ,, ,, urinogenital sinus and related parts . . 135 



803. ,, development 135 



804. ,, sections of embryos 136 



805. ,, nuviatilis, head of larva 137 



806. Head of Myxine and of Bdellostoma 139 



807. Myxine glutinosa, dissection 140 



808. ,, auditory organ 141 



809. Bdellostoma, kidney 141 



810. Palseospondylus gunni . 143 



811. Hemiscyllium modestum 145 



812. Scyllium canicula, vertebrae 147 



813. Hemiscyllium, skull 148 



814. ,, visceral arches 150 



815. ,, pectoral arch and fin 151 



81(>. ,, pelvic arch and fin 152 



817. ,, lateral dissection 153 



818. ,, branchial sac 154 



819. Scyllium, heart and branchial arteries ...... 155 



820. Hemiscyllium, blood-vessels 157 



821. Scyllium canicula, brain 158 



822. Hemiscyllium, brain 159 



823. Scyllium catulus, cranial nerves and branchial plexus . . . 160 

 823 bis. ,, canicula, cerebral nerves 162 



824. ,, ,, urinogenital organs . . ... 164 



825. Hemiscyllium, right kidney and urinary sinus . . . . 166 



826. Dog-fish, egg-case 166 



827. Cladoselache fyleri 167 



828. Pleuracanthus ducheni 168 



829. Acanthodes wardi 169 



830. Chlamydoselachus anguineus 169 



831. Lamna cornubica 170 



832. Urolophus cruciatus 171 



