xii LIST OF ILLUSTRATIONS 



FKi. ^AGE 



790. Torpedo, showing electric organ 163 



791. Cestracion galeatus, egg-case 167 



792. Pristiurus, section of blastoderm 168 



793. Elasrnobraiich 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 Callorhynchus 174 



800. ,, vertebral column 176 



801. ,, skull 177 



802. Callorhynchus antarcticus, skull . . . . . . . 178 



803. ,, brain ^ . . 180 



804. ,, ,, male urinogenital organs . Me? ^^. . 181 



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



806. Salmofario .184 



807. ,, ,, head 185 



808. ,, ,, scale . . . . . . . . . . .186 



809. ,, ,, vertebrae 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. Acipenser ruthenus 203 



825. Lepidosteus platystomus 203 



826. Amia calva 204 



827. Rita buchanani 205 



828. Gadus morrhua 205 



829. Sebastes percoides 206 



830. Labrichthys psittacula .206 



831. Ostracion 207 



832. Hippocampus 208 



833. Pleuronectes cynoglossus 211 



834. Stomiasboa 212 



835. Ctenoid and ganoid scales . 212 



836. Polypterus, part of vertebral column . 213 



837. Sturgeon, skull 214 



