INDEX 



387 



Cyclostomes — Continued 

 Muscles, 181 

 Spinal nerves, 277 

 Urinogenital system, 258, 259 

 "Vertebrae, 148 



Darwin, Charles, 323 

 Decussation, 293 

 Degenerate, Def., 7 

 Dental formula, 140 

 Dermal bone. 103, 110 



of skull, 131 

 Dermal denticles. 35, 108 

 Dermal plates. 109 ff. 



Ostracodermi. 33 



Teleostomi, 39 

 Dermis, 107 



Development, regulators, 313 

 Diaphragm, 216 

 Diapsida, 60 

 Diencephalon, 290 

 Digestive glands, 318 



Development, 194 

 Digestive system 



Amphioxus, 16 



Development, 193 



Human, 203 

 Digestive tract, modifications of, 196 

 Digitigrade. 168, 169 

 Dipnoi, 45. 344 



Gills, 210 

 Dogfish 



Brain, 286 



Chondrocranium, 126 



Dermal denticles, 108. 109 



Digestive tract, 198, 201 



Fin, 159 



Gills, 209 



Muscles. 183 



Urinogenital system, 258 



Vascular system, 222 



Vertebrae, 148 

 Dura mater, 274 



Ear, external. 312 

 Ear, inner. 309 



Cyclostome. 32 

 Ear, middle, 144, 311 

 Ear ossicles, 145 ff., 311, 349 



Homologies. 147 

 Echidna, 77, 78 

 Edentates, 86 



Elasmobranchii, 36 

 Elephant, 89 



Tusks, 143 

 Embryology 



Amphioxus, 21 



Bird, 75 



Cyclostome, 32 



Frog. 52 



Marsupial, 79 



Placental. 92 



Reptile, 64 

 Enamel, 108 

 End organs, 301 

 Endocrine glands, 316, 320 

 Endolymph, 309 

 Endostyle 



Amphioxus, 16 



Tunicate, 13 

 Enterocoels, 24 

 Eogyrinus, 345 

 Epaxial muscles, 175 

 Epidermis, 107 

 Epididymis, 262 

 Epimere 



Amphioxus, 24 



Development, 175 

 Epiphysis 



Bone. 172 



Brain. 290 

 Epithelial tissues, 99 

 Erythrocytes, 247 

 Esophagus 



Development, 193 



Structure, 199 

 Eustachian tube, 145, 206, 207, 311 

 Eutheria, 80 

 Excretory organs, 251 

 Extensors. 181 

 External gills 



Crossopterygii, 44, 45 



Dipnoi. 45. 46 



Tadpole, 55 

 Eye, 304 



Cavities, 308 



Embryology. 305 



Function. 308 



Lids, 309 



Muscles. 296 



Structure, 306 



Facial nerve, 297 

 Feathers, 114 



