LIST OF ILLUSTRATIONS xi 



FIG. 



795. Development of eye .......... 109 



796. Muscles and nerves of eye .......... 110 



797. Pineal eye of Sphenodon .......... Ill 



798. Organ of hearing ........... 112 



799. Section of ampulla ........... 112 



800. Urinary tubule ............ 114 



801. Diagrams of urinogenital organs . ...... 115 



802. Development of mesoderm in Frog ...... . 117 



803. Petromyzon fluviatilis, external views of head ..... 120 



804. ,, marinus, skull, with branchial basket . . . .121 



805. ........ 122 



806. ,, dissection of female ...... 125 



807. brain ......... 127 



808. with olfactory and pituitary sacs . 128 



809. ,, de velopment of olfactory and pituitary sacs . 129 



810. ,, ,, auditory organ ....... 130 



811. ,, ,, transverse section of trunk . . . .130 



812. ,, urinogenital sinus and related parts . . 131 



813. development . ....... 131 



814. ,, sections of embryos ........ 132 



815. fluviatilis, head of larva ....... 133 



816. Head of Myxine and of Bdellostoma ....... 135 



817. Myxine glutinosa, dissection ......... 136 



818. auditory organ .......... 137 



819. Bdellostoma, kidney ........ . .137 



820. Palseospondylus gunni .......... 138 



821. Hemiscyllium modestum .......... 141 



822. Scyllium canicula, vertebrae ......... 142 



823. Hemiscyllium, skull .......... 143 



824. ,, visceral arches . ....... 146 



825. pectoral arch and fin ....... 147 



826. pelvic arch and fin ........ 147 



827. ,, lateral dissection . ....... 148 



828. branchial sac ......... 149 



829. Scyllium, heart and branchial arteries ....... 150 



830. Hemiscyllium, blood-vessels ......... 152 



831. Scyllium canicula, brain .......... 154 



832. Hemiscyllium, brain .......... 155 



833. Sycllium catulus, cranial nerves and branchial plexus . . .156 



834. ,, canicula, cerebral nerves ........ 157 



835. urinogenital organs ...... 160 



836. Hemiscyllium, right kidney and urinary sinus ..... 161 



837. Dogfish, egg-case ........... 161 



838. Cladoselache fyleri ........... 162 



839. Pleuracanthus ducheni .......... 163 



840. Acanthodes wardi ........... 164 



841. Chlamydoselachus angumeus ........ 164 



842. Lamna cornubica ........... 165 



