INDEX 



811 



Myliobatis, 170, 182, 250. 

 Myocomma, amphioxus, 27. 



Lampetra, 85. 

 Myogale, 584. 

 Myomorpha, 656. 

 Myotis, 588. 

 Myotome, actinopterygii, 200. 



amphibia, 302. 



amphioxus, 26, 28. 



ascidian tadpole, 68. 



function in fishes, 133. 



Lampetra, 85, 94. 



pro-otic, 149. 

 Myrmecobius, 565. 

 Myrmecophaga, 596. 

 Mystriosuchus, 418. 

 Myxine, 109, 122. 



Nannippus, 737. 



Narzvhal, 674. 



Native cats, 565. 



Natrix, 413. 



Neanderthal man, 647. 



Necrolemur, 617. 



Nectophrynoid.es, 361, 366. 



Necturus, 358, 364. 



Neoceratodas, 199, 262, 268, 275, 322, 



771. 

 Neognathae, 516. 

 Neolithic culture, 641. 

 Neomylodon, 597. 

 Neophron, 517. 



Neoteny, see Paedomorphosis. 

 Nephridia, 35. 

 Nephrotome, 94. 

 Nerve cord, see Spinal cord. 

 Nerve fibres, amphioxus, 37. 



Lampetra, 98. 



See Conduction velocity. 

 Nerve roots, amphioxus, 37. 



Balanoglossus, 55. 



cephalaspida, 127. 



cranial segmentation, 148. 



hag-fishes, 124. 



Lampetra, 97. 

 Nerves, cranial, see Cranial Nerves. 

 Nervous system, amphioxus, 36. 



Balanoglossus, 54. 



Lampetra, 97. 



polyzoa, 59. 



tunicates, 64, 69. 



See Brain, Spinal cord. 

 Nesomimus, 525. 

 Nest-building, 112, 505, 555. 

 Neural gland, 65. 

 Neuropil, amphibia, 345. 



Lampetra, 98. 

 Neuropore, amphioxus, 39. 

 Neurosecretion, 40, 208. 



Newts, 303, 364. 

 Nightingale, 522. 

 Nightjar, 520. 

 Niobium, 62. 

 Nitrate, in sea, 286. 

 Nodosaurus, 426. 

 Nose, see Olfactory organ. 

 Notharctus, 614. 

 Nothosaurs, 399. 

 Notidanoidea, 180. 

 Notochord, amphibia, 303. 



amphioxus, 27, 42. 



Balanoglossus, 51. 



Cephalodtscus, 58. 



dipnoi, 275. 



elasmobranchs, 132, 176. 



Jamoytius, 128. 



Lampetra, 86. 



La timer ia, 272. 



tunicates, 68. 

 Notomys, 660. 

 Notoryctes, 565, 778. 

 Notostylops, 701. 

 Nototrema, 366. 

 Notoungulata, 701. 

 Nucleic acids, 8. 

 Numbers, amphibia, 297. 



birds, 432. 



fishes, 191. 



fluctuations, 663. 



horses, 739. 



man, 641. 



rodents, 663. 



species, 769. 

 Numenius, 519. 

 Numida, 518. 

 Nycticebns, 613. 



Odobenus, 692. 



Odontognathae, 513. 



Oikopleura, 73. 



Okapi, 757. 



Olfactory organ, actinopterygii, 220. 



agnatha, 125, 129. 



amphibia, 333, 350. 



amphioxus, 40. 



birds, 490. 



crossopterygii, 270. 



dipnoi, 276. 



elasmobranchs, 167, 170. 



hag-fishes, 123. 



Lampetra, 108. 



mammals, 615. 



primates, 615. 



reptiles, 385. 

 Oligokyphus, 544. 

 Omphalosaurns, 401. 

 Operculum, 184, 193, 327. 

 Ophidia, 411. 



