Descending aorta, 284 
tracts, 40 
Desmognathous, 97 
Deutoplasm, 8 
Diaphragm, 123, 135 
Diapophysis, 46 
Diarthrosis, 38 
Diastole, 272 
Diencephalon, 142 
Digastric muscle, 133 
Digestive tract, 12, 205 
Digitigrade, 120 
Digits, 116 
Dilator pupillz, 202 
Diphycercal, 50 
Diphyodont dentition, 211 
Dipnoi, brain, 154 
circulation, 292, 295 
excretory organs, 327 
lungs, 257 
reproductive organs, 333 
skull of, 80 
Discus proligerus, 320 
Dorsal aorta, 275 
fissure of cord, 139 
nerve root, 161 
vertebra, 49 
Down feathers, 31 
Dromzognathous, 97 
Ductless glands, 18 
Ductus arantii, 277 
arteriosus, 283 
Botalii, 283 
Cuverii, 271, 278 
venosus, 277 
Dumb-bell bone, 69, ror 
Duodenum, 227 
Dura spinalis, 152 
Ear, 182 
bones, 73 
external, 187 
functions of, 188 
inner, 183 
middle, 187 
stones, 186 
Ect-ental line, 9 
Ectethmoid, 67 
Ectobronchus, 259 
Ectochondrostosis, 43 
Ectoderm, 9 
Ectopterygoid, 80, 88 
Ectoturbinals, 196 
Efferent branchial artery, 274 
INDEX. 
Elasmobranchs, girdles of, 105 
intestine, 228 
reproductive organs, 331 
skull, 76 
Elastica externa, 45 
interna, 44 
Elastic tissue, 22 
Electrical organs, 135 
Electric plates, 135 
Electroplax, 136 
Embolomerous, 48 
Embryology, 1, 6 
Embryonic tissue, 22 
Eminentia medialis, 145 
Enamel, 40 
organ, 40, 209 
Endocardium, 269 
Endolymph, 185 
duct, 183 
sac, 183 
End organs, 178 
Endorhachis, 151 
Endoskeleton, 38, 42 
Ensiform process, 56 
Entepicondylar foramen, 120 
Enteroceele, 10 
Enteropneusta, 2 
Entobronchus, 259 
Entochondrostosis, 43 
Entoderm, 9 
Entoglossal, 80, 97, 218 
Entoplastron, 42, 159 
Entopterygoid, 80 
Entoturbinals, 196 
Entovarial canal, 326 
Envelopes of nervous system, 151 
Eparterial bronchi, 262 
Epaxial muscles, 127 
Ependyma, 139 
Epibranchial cartilage, 65 
Epibranchial ganglia, 176 
muscles, 133 
Epicardium, 124, 269 
Epiceele, 143 
Epicoracoid, 107 
Epidermis, 25 
Epididymis, 322 
Epigastric artery, 288 
vein, 289 
; Epiglottis, 252, 253 
Epimerals, 54 
Epimere, 13 
Epineurals, 54 
Epiotic, 67, 69 
389 
