352 



INDEX. 



Mesentery, 12, 142 

 Mesentery of starfish, 279 

 Mesoderm, 318 

 Mesotliorax, 171 

 Metabola, 217 

 Metacarpals, 134 

 Metacarpus, 45 

 Metamorphosis, 184, 335 

 Metatarsals, 134 

 Metathorax, 171 

 Metazoa, 318 

 Metridium, 303 

 Mice, 108 

 Microstomum, 243 

 Milk dentition, 100 

 Millers, 199 

 Mink, 121 

 Minnows, 25 

 Mites, 232 

 Moccasin, 68 

 Mola, 30 

 Molars, 93, 100 

 Moles, 109 

 Mollusca, 269, 320 

 Molluscoida, 246 

 Monkeys, 123 

 Monotocardia, 275 

 Monotremata, 102 

 Mosquitoes, 225 

 Moss animals, 246 

 Mother-of-pearl, 262 

 Moths, 199 

 Motor nerve, 135, 136 

 Mouth parts, 158 

 Mourning-cloak, 204 

 Myotome, 11 

 Myrmeleon, 222 

 Mytilus, 261 

 Musca, 224 

 Muscle-plates, 11 

 Muscles of eye, 140 

 Muskalonge, 26 

 Musk-ox, 120 

 Muskrat, 107, 108 

 Mussels, 261 



Nails, 97 



Naked molluscs, 276 

 Nandu, 78 

 Narwal, 112 



Nasal organs, 35 



Natatores, 78 



Nauplius, 208 



Nautilus, 267 



Nemathelminthes, 245 



Nephridia, 208 



Nereis, 240 



Nettle-cells, 300, 310 



Nerves of head, 136 



Nervous system of vertebrates 



134 



Neural arch, 128 

 Neuroptera, 220 

 Nictitating membrane, 56, 139 

 Nidamental gland, 253 

 Nose, 137 

 Nostrils, 137 

 Notochord, 18, 127 

 Notochordal sheath, 127 

 Nototrema, 53 

 Nudibranchs, 276 

 Nutria fur, 108 



Oblique muscles, 140 

 Ocelli, 173 

 Octocoralla, 303 

 Octopoda, 267 

 Octopus, 267 

 Ocular plates, 283 

 Oculomotor nerve, 186 

 Odonata, 219 

 Odontornitb.es, 76 

 (Eneis, 204 

 Oesophagus, 12, 141 

 Oil-bottle, 187 

 Oil-glands, 71 

 Olfactory lobes, 15, 94 

 Olfactory nerve, 19, 136 

 Olfactory organs, 137 

 Oligochaetae, 239 

 Olive-shells, 275 

 Operculum, 10, 144 

 Operculum of molluscs, 274 

 Ophidia, 67 

 Ophiopholis, 293 

 Ophiuroidea, 293 

 Opisthobranchia, 276 

 Opisthoccelous, 129 

 Opossum, 103 

 Optic lobes, 15, 135 



