INDEX 



265 



Muscles, 20 



Muscle fibres, Hydra, 230 



Medusa, 250 

 Muscular tissue, 6, 94 

 Musculo-cutaneous vein, 52 

 Musculus retractor bulbi, 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 Actinosphaerium, 139, 143 



of Badhamia, 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 geniculata, 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, 120 



Oosperm, 126 



Opisthocoelous vertebrae, 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 morum, 177 

 Paramecium aurelia, 187 

 bursaria, 1 88 



caudatwH) 187 



Paramceba eilhardi^ 135 

 Paramylum, 163 

 Parasitism, 158 



