Mylencephalon, 383 

 Myliobatts teeth, 246, 247, 248 

 Myocardium, 339 

 Myocoel, 143, 420 

 Myodome, posterior, 107, 109, 114 

 Myofibrils, 11 

 Myomere, chordate, 421 

 Myomeres, 6, 421 

 Myosclerotome, 143 

 Myotome, 143, 420 

 Mynacanthus, 123 



Myxine, myxinid, (see also Eptalrelus), 20, 23, 

 128, 131, 134, 226, 278, 289, 353, JfiO, 

 366, 379, 408 



brain, 397 



cloacal region, 313 



comparison with Pteraspid, 137 



cranial nerves, 40! 



development, 205, 209 



digestive tract, 277 



head skeleton of, 133 



heart, 345, 346 



inner ear, 409 



kidney, 316, J/ 7 



liver and gut interrelationships, 279 



mouth and pharynx, 278 



reproductive system, 336 



skin, 227 



tooth, 246 



viscera, 279 



NAEF, 188 



Nails, 217, 218 



Nasal, 39, 44, 45, 79, 85, 105, 114 



Nasal capsule, 23, 108, 127, 129, 131, 132 



Nasal opening, 27 



Nasal organ, 402 



Nasal passage, 253 



lower blind sac, 403 

 Nasal placode, 402 

 Nasal sac, 130 



Nasal septum, 48, 53, 54, 108, 122 

 Nasal sinus, 363 

 Nasal tube, 25 



Nasohypophyseal duct, 18, 31, 132, 277 

 Nasopalatine duct, 



incisive or Steno's duct, 403 

 Naturphilosophie, 34 

 Naviculare, 172, 173 

 NEEDHAM, 3 

 Neck opening of scale, 234 

 Necturus, 21, 79, 80, 151, 152, 177, \lii,214, 

 223, 249, 262, 264, 281, 286, 287, 299, 

 300, 325, 343, 349, 356, 357, 365, 389, 

 391,406,418 



aortic arches, 349 



arteries of head, 358 



brain, 390 



digestive tract, 263 



endolymphatic sac, 408 



external appearance, 27, 28 



kidney, blood supply, 300 

 NEILSEN, 3 



Neoceralodus, 21, 99, 102, 104, 112, 156, 179, 

 180, 239, 240, 242, 243, 266, 283, 284, 

 287, 288, 289, 303, 304, 327, 338, 344, 

 345, 350, 351, 370, 391, 392, 416 



aortic arches, 351 

 endocranium development, 103 

 external appearance, 27, 27 

 fin rays, 244 

 head skeleton, 102 

 ovary, 329 

 pectoral fin, 181 



sensory-canal system, development, 417 

 urogenital system, 328 

 vertebrae, 157 

 Neomorph, 172 

 Neopallium, 387 



Neorhachitomous vertebrae, 155 

 Neotenic, 27, 287 

 Nephric duct (pronephric duct, Mesonephric 



duct. Wolffian duct), 293, 301 

 Nephric glomerulae, 9 

 Nephric vesicle, 7 

 Nephridium of Hatschek, 8 

 Nephrocoel, 300, 307, 314 

 Nephrogenic cord, 294 

 Nephron, 297, 302 

 Nephrotome, 300, 314, 420 

 Nerve, sensory, 386 

 Nervous system, 9, 12, 13, 16, 383 

 NEUMAYER, 139 

 Neural arches, 141, 142, 143, 145, 146, 147, 



148, 152, 153 

 Neural canal, 141, 142, 143, 195, 200 

 Neural crest, 128, 387, 420 

 Neural fold, 205 

 Neural gland, 1 1 

 Neural groove, 203, 205 

 Neural keel, 198 

 Neural plate, 195, 198, 200, 205 

 Neural ridge, 200, 203 

 Neural spine, 141, 142, 146, 147, 153 



double, 158 

 Neural strand, see neural keel 

 Neural tube, 6, 143, 198 

 Neurenteric canal, 195, 200, 205 

 Neurocentral suture, 146 

 Neurohypophysis, 379 

 Neuromast, macula or sensory organ, 410, 



412 

 Neuropore, anterior, 200 



posterior, 200 

 Neurula, 195, 201 

 Neutrophile, 377 

 Nipple, 220 



in marsupium, 30 

 Nictitating membrane, 422 

 Nidamental gland, 334 

 Nodose ganglion of vagus nerve, 387 

 Nomina Anatomica, 34, 35 

 Nomina Anatomica Comparate, 34 

 Nonkinetic skull, 65, 72 

 Nostoiepis, 20, 233, 233 

 Notch of Rivinus, 40 



Notochord, 5, 11, 99, 107, 108, 121, 127, 

 129, 131, 143, 148, 149, 159, 205, 208, 

 314 

 embryological origin of, 195, 199 

 Notochord canal in basis cranii, 94, 114 



in vertebrae, 155 

 Notochord sheath, 8, 155, 162 

 cartilage invasion, 122 



Notoryctes, 255 



Nuchal (lambdoidal) crest, 37 



Nucleus, egg, 194 



Nucleus, nerve, 384 



Nutritive foramina of vertebrae, 144 



Nutritive veins, 365 



Obturator externus, 430 

 Obturator fenestra, 176 

 Obturator foramen, 172, 176 

 Obturator internus, 428 

 Occipital arch, 51, 53, 64, 107, 121, 129 

 Occipital artery, 354 

 Occipital bones, 37, 44, 106 

 Occipital condyle, 61 

 basioccipital, 86 

 exoccipital, 80 

 Occipital sinus, 360 

 Occipital vein, 360 

 Occipitocapsular fissure, 51 

 Oculomotor nerve (III), 386 

 foramen, 129 

 nucleus, 386 

 Odontoblasts, 228, 233, 245 

 Odontoid process, 141, 142, 145, 146, 152, 



153 

 OKEN, 2, 35 

 Olfactory bulbs, 383 

 Olfactory chamber, 386 

 Olfactory epithelium, 386 

 Olfactory lobe, 386 

 Olfactory nerve (I), 386 



foramen, 130 

 Olfactory tract, 386 

 Olfactory vesicle, 199 

 Olecranon, 171 

 Oligocene, 62 

 Olivarv nuclei, 385 

 OLSON, 71 

 Omoanconeus, 427 

 Omosternum, 177 

 Omphalomesenteric veins, 339 

 Oocytes, 327 

 Ooplasm, 193, 194 

 Opercle, 94, 106 

 Operculum, 23, 24, 27, 82, 82, 94, 106, 114, 



125, 287, 288, 289 

 Opisthotic, 61, 76, 80, 83, 106 

 Opossum, 141, 171, 172, 212, 255. 384 

 brain, 385 



chondrocranium, 54 

 digestive tract, 256 

 egg, 194 



external appearance, 29 

 head skeleton, 43, 43, 44 



development, 59 

 manus and pes, 172 

 pectoral girdle, 172 

 reproductive tract, female, 322 

 supracoracoideus muscle, development, 

 433 

 Ophiacodon, 146, 175, 176, 176 

 Ophiodon, 357, 358, 359 

 Ophthalmic artery, 354 

 Ophthalmicus, profundus, branch of Tri- 

 geminal nerve (Vi), 386 

 Opisthocoelous vertebra, 148, 150, 161 



470 • INDEX 



