xii LIST OF ILLUSTRATIONS 



FIG. PAGE 



790. Torpedo, showing electric organ . . . 163 



791. Cestracioii galeatus, egg-case . ... 167 



792. Pristiurus, section of blastoderm . . . 168 



793. Elasmobranch embryo, sections . . 169 



794. Scyllium canicula, embryo . . 170 



795. Ray, embryo . 170 



796. - Elasmobranch embryo with yolk-sac . . 171 



797. Scyllium canicula, head of embryo . . . 172 



798. ,, ,, ,, ,, later stage . . 172 



799. Chimsera and Callorhyiichus ... . . 174 



800. ,, vertebral column ... . . 176 



801. ,, skull . .177 



802. Callorhyiichus antarcticus, skull . ... 178 



803. ,, ,, brain . 180 



804. ,, ,, male urinogenital organs . . 181 



805. ,, ,, embryo in egg-shell ... . 182 



806. Salmo fario . 184 



807. ,, ,, head . 185 



808. ,, scale 186 



809. ,, ,, vertebra .... . .186 



810. caudal end of vertebral column 187 



811. ,, ,, skull 188 



812. ,, ,, ,, disarticulated . ... . 189 



813. , , salar, skull of young individual . ... 193 



814. ,, fario, fin-ray . . . 193 



815. ,, ,, shoulder-girdle and pectoral fin . 194 



816. , , , , pelvic fin ... . 195 



817. ,, ,, side dissection . . . . . 196 



818. ,, ,, brain 198 



819. ,, ,, eye 199 



820. ,, ,, auditory organ ... ... . 199 



821. ,, ,, urinary organs . . ... 200 



822. ,, ,, development 201 



823. Polypterus bichir 202 



824. Acipeiiser ruthenus .... . . 203 



825. Lepidosteus platystomus ... . . . 203 



826. Amia calva . 204 



827. Rita buchaiiani . . 205 



828. Gadus morrhua . . 205 



829. Sebastes percoides . . . 206 



830. Labrichthys psittacula . 206 



831. Ostracion . 207 



832. Hippocampus . 208 



833. Pleuronectes cynoglossua . .211 



834. Stomias boa 212 



835. Ctenoid and ganoid scales . . . . 212 



836. Polypterus, part of vertebral column . .... 213 



837. Sturgeon, skull . 214 



