LIST OF ILLUSTRATIONS xiii 



FAt:E 



838. Polypterus, skull . 215 



839. ,, pectoral tin . 216 

 839 /,/.s. ,, pelvic fin 216 



840. Gymnotus electricus 217 



841. Sargus, teeth . 218 



842. Anabas scandens 



843. Lepidosteus, digestive organs . 220 



844. Pseudophycis bachus, relation of air-bladder to auditory organ . 221 



845. Lepidosteus, brain .... 



846. ,, male organs 



847. ,, and Amia v female organs . 224 



848. segmentation . 225 



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849. Polypterus, head of larva 226 



850. Glyptolepis and Macropoma . . 227 



851. Pakeoniscus and Platysomus . 



852. Lepidotus and Caturus 



853. Ceratodus forsteri ..... . 230 



854. ,, ,, anterior portion of skeleton . . 231 



855. ,, skull, dorsal . 232 



856. ,, ,, ,, ventral . . 232 



857. ,, ,, pelvic arch and fin . 



858. lung ... .234 



859. ,, ,, heart and main blood-vessels . 235 



860. ,, brain . . .236 

 861 ,, r , reproductive organs, female . . 237 



862. ,, ,, development .... . 238 



863. Protopterus annectens ........ . 241 



864. ,, ,, skull, shoulder-girdle, and fore-limb . . 242 



865. Coccosteus decipiens . ... . . 242 



866. Pteraspis rostrata 243 



867. Cephalaspis . 244 



868. Pterichthys testudinarius . 245 



869. Rana temporaria . . 246 



870. ,, ,, skeleton . 248 



871. skull . . . 250 



872. ,, ,, skull of tadpole . . 252 



873. ,, esculenta, shoulder-girdle . 253 



874. ,, ,, pelvic-girdle . 254 



875. .. ,, muscles ... . 255 



876. ,, temporaria, dissection from left side . . . 257 



877. ,, esculenta, digestive organs . 258 



878. ,, temporaria, heart . 259 



879. ,, ,, arteries . 260 



880. ,, ,, veins ... 262 



881. ,, esculenta, brain 



882. ,, accessory auditory apparatus . 265 



883. ,, esculenta, urinogenital organs, male . 266 



884. ,, female . 267 



