INDEX 



265 



Muscles, 20 



Muscle fibres, Hydra, 230 



Medusa, 250 

 Muscular tissue, 6, 94 

 Musculo-cutaneous vein, 52 

 Musculus retractor bulhi, 65 

 Mycetozoa, 147, 153 

 Myelencephalon, 62 

 Myelin, 92 



Nares, 17 



Nasal bones, 27 



Navicular bone, 33, 37 



Nematocysts, 193, 224, 226, 230 



Nerve, 9 



Nerve fibres, 90 



Nerve ganglion cells, 90 



Nervous system, 8, 58, 231 



Nervus recurrens, 67 



Neural arch, 22 



Neural canal, 22 



Neural spine, 23 



Neurilemma, 92 



Neuroepithelium, 88 



Node of Ranvier, 93 



Non-medullated nerve fibre, 94 



Non-striated muscle fibre, 94 



Nostrils (see Nares) 



Notochord, 22 



Nucleated sheath of Schwann, 93 



Nucleic acid, 79 



Nuclein, 79 



Nucleocentrosome, 166 



Nucleolus, 112 



Nucleoplasm, 78 



Nucleus, 73, 74, 78, 79, in, 112 



Nucleusof Actinosphrerium, 139, 143 



ofBadhamia, 148, 150 



of Bodo, 174, 



of Euglena, 163 

 Nutrition of plants and animals, 5 



of Euglena, 164 



of nerve fibre, 93 

 Nutritive cells of Hydra, 233 



Obelia geniatlafa, 241 

 Occipital condyles, 24, 26 

 Occipital artery, 50 

 Occipito-vertebral artery, 50 

 Ocelli, 246 

 Oesophageal artery, 50 



Oesophagus, 18, 40 



Olecranon, 30 



Olfactory capsules, 26 



Olfactory cells, 88 



Olfactory lobes, 63 



Olfactory nerves, 65 



Olfactory organ, 71 



Omosternum, 30 



Oocyte, 1 20 



Oosperm, 126 



Opisthocoelous vertebra', 22 



Ophthalmic branch of 5th nerve, 66 



Optic capsules, 26 



Optic chiasma, 65 



Optic lobes, 62 



Optic nerves, 65 



Optic thalami, 62 



Orbital cavity, 28 



Order, 255 



Organ, 6 



Organic continuity of cells, 184 



Organisation of protoplasm, 77, 79 



Origin of muscle, 21 



Os cruris, 33 



Os magnum, 37 



Ossification, in cartilage, 107 



in membrane, 106 

 Osteoblasts, 106 

 Osteoclasts, 107 

 Osteogenic fibres, 107 

 Otocysts, 246 

 Otoliths, 71 

 Ovarian veins, 54 

 Ovaries, 43, 44, 237 

 Oviducts, 44 



Ovum, 44, 117, 120, 218 

 Oxygen, 8, 45, 163 

 Oxyntic cells, 87 



Palate, 19 

 Palatine bone, 27 

 Palatine nerve, 66 

 Pancreas, 40, 87 

 Pancreatic duct, 41 

 Pandorina niorum, 177 

 Paramecium aurelia, 187 



btirsaria, 1 88 



eaudatutn, 187 

 Paravicfba eilhardi, 135 

 Paramylum, 163 

 Parasitism, 158 



