3^8 



INDEX 



Nephrostome, 24, 42, 275, 276 

 Nervous system, of Distomum, 6 



of earthworm, 26 



of Anodonta, 64 



of gastropods, 77 



of Apus, 104 



of crayfish, 1 34 



of cockroach, 162 



of Amphioxus, 188 



of dogfish, 234 



of mammals, 297 



Nervures, 154 

 Neural arches, 209 

 Neural crest, 279 

 Neural flexure, 262 

 Neural folds, 256, 257, 301 



groove, 258, 301 



plate, 210, 257 



spines, 210 



tube, 192 



Neurenteric canal, 193, 258 

 Neuroblast, 40 

 Neuropodium, 49 

 Neuropore, 175, 188, 193 

 Notochord, 173, 179, 194, 201, 



209, 210, 248, 260, 262, 267, 



281 

 Notochordal tissue, 179 

 Notopodium, 49 

 Nuchal groove, 92 

 Nucleus pulposus, 290 

 Nymph, 170 



Oblique muscles of eye, 238, 242 

 Occipital condyles, 211 



foramen, 153 



nerves, 243 



Odontophore 69, 76 

 CEsophagus, see Alimentary canal 

 Olfactory capsules, 211 



hairs, 1 36 



lobes, 235, 278 



nerves, 236 



organs, 245, 279 



pit, 175 



Oligocheeta, 48 

 Omentum, 220 

 Ommatidium, 137 

 Omphaloidean placenta, 304 

 Ontogeny, 282 

 Oostegopod, 98, 106, III 



Optic capsules, 211 



chiasma, 236 



cup, 280 



ganglion, 144 



lobes, 140 



Optic nerve, 236, 280 



vesicles, 280 



Oral tentacles, 177 



Organs of Bojanus, 64, 73 



Organ of Corti, 298 



Omithorhynchus, 292, 307 



Orthoneurous, see Euthynearous 



Os articulare, 292 



Os orbiculare," 291 



Osphradium, 65 



Otocyst, 65, 80, 87 



Otolith, 65 



Ovary, of Distomum, 5 



of earthworm, 33 



of Apus, 106 



of crayfish, 139 



of cockroach, 164 



of Amphioxus, 189 



of dogfish, 233 



of mammals, 299 



Oviducal pores, 20 



funnel, 277 



Oviduct, of Distomum, 5 



of earthworm, 33 



of Apus, 106 



of crayfish, 140 



of dogfish, 232 



of frog, 277 



of mammals, 298 



Ovisac, 33 

 Ovotestis, 80 



Palp, 123, 152 

 Paludina vivipara, 70, 79 

 Pancreas, 219, 264 

 Parachordal plates, 269 

 ParaglossEe, 152 

 Parapodia, 48, 49 

 Pareiopods, 117, 144 

 Parenchyma, 6 

 Parovarium, 298 

 Parthenogenesis, 14, 106 

 Pedal ganglia, 64 

 Pelvic girdle, 293 

 Penis, 81 

 Pericardial sinus, 160, 161 



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