LIST OF ILLUSTRATIONS xiii 



FIG. PAGE 



-881. Hippocampus . 223 



882. Pleuronectes cynoglossus . 227 



883. Stomias boa 228 



884. Ctenoid and ganoid scales 228 



885. Polypterus, part of vertebral column 229 



886. Sturgeon, skull 230 



887. Polypterus, skull . 231 



388. , , pectoral tin 232 



889. ,, pelvic fin ' 232 



890. Gymuotus electricus 233 



891. Sargus, teeth 234 



892. Anabas scandens . 235 



893. Lepidosteus, digestive organs . . 236 



894. Pseudophycis bachus, relation of air-bladder to auditory organ . 237 



895. Lepidosteus, brain 238 



,, male organs 239 



,, and Amia, female organs 240 



,, segmentation 241 



Polypterus, head of larva 242 



9( )(>. Glyptolepis and Macropoma 243 



901. Palseoniscus and Platysomus 244 



902. Lepidotus and Caturus . . . 245 



Ceratodus forsteri . 247 



,, ,, anterior portion of skeleton .... 248 



,, ,, skull, dorsal . . 249 



,, ,, ,, ventral 249 



,, ,, pelvic arch and fin 250 



,, ,, lung 251 



,, ,, heart and main blood-vessels .... 252 



,, ,, brain 253 



,, ,, reproductive organs, female .... 255 



,, ,, development 256 



913. Protopterus annectens 258 



914. ,, ,, skull, shoulder-girdle, and fore- limb . . 259 



915. Coccosteus decipiens 260 



916. Pteraspis rostrata 261 



917. Lanarkia spinosa 262 



918. Drepanaspis gemundenensis . 262 



919. Cephalaspis 263 



920. Pterichthys testudinarius . 264 



921. Rana temporaria 265 



,, skeleton 267 



skull 269 



,, ,, y , of tadpole . 271 



,, esculenta, shoulder-girdle 272 



,, ,, ,, ,, transverse section, diagrammatic 272 



,, pelvic-girdle 273 



,, muscles . . 275 



