LIST OF ILLUSTRATIONS xiii 



FTC. 



891. Ostracioii ...... 216 



892. Hippocampus ..... .217 



893. Pleuronectes cynoglossus . . 220 



894. Stomias boa .... 221 



895. Ctenoid and ganoid scales 



896. Polypterus, part of vertebral column . 



897. Sturgeon, skull . . 223 



898. Polypterus, skull . . . 224 



899. pectoral fin . . 225 



900. pelvic fin 225 



901. Gymnotus elect ricus ... 226 



902. Sargus, teeth ... 227 



903. Anabas scan dens 



904. Lepidosteus, digestive organs ..... 229 



905. Pseudophycis bachus, relation of air-bladder to auditory organ . 230 



906. Lepidosteus, brain ...... 231 



907. ,, male organs .... 



908. ,, and Amia, female organs . .233 



909. Acipenser, Amia, and Lepidostexis, segmentation . 234 



910. Polypterus bichir, head of larva .... 235 



911. Glyptolepis and Macropoma ..... . 236 



912. Palseoniscus and Platysomus . . . 237 



913. Lepidotus and Caturus ..... 238 

 914 Ceratodus forsteri ....... . 240 



915. ,, ,, anterior portion of skeleton . . . 241 



916. skull, dorsal .... .242 



917. ventral .... .242 



918. ,, pelvic arch and fin .... . 243 



919. lung . . 244 



920. heart and main blood-vessels .... 245 



921. brain ...... .246 



922. ,, ,, reproductive organs, female . . 248 



923. development . . . 249 



924. Protopterus annectens ....... .251 



925. ,, skull, shoulder-girdle, and fore -limb . . 252 



926. Coccosteus decipiens .......... 253 



927. Pteraspis rostrata ........... 254 



928. Lanarkia spinosa ..... . 254 



929. Drepanaspis gemundenensis ......... 254 



930. Cephalaspis ........ . 255 



931. Pterichthys testudinarius .... . . . 256 



932. Rana temporaria ....... . 257 



933. skeleton ..... . 259 



934. skull . . .261 



935. of tadpole . 263 



936. ,, esculenta, shoulder-girdle ........ 263 



937. ,, ,, ,, ,, transverse section, diagrammatic 264 



938. pelvic girdle ........ 265 



