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-meduUated 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, III, 112 



Nucleusof Actinosphserium, 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 genictilata, 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, lo5 



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^ 1S7 



bursariUy 188 



caudatum, 187 



Paramceba eilhardi, 135 

 Paramylum, 163 

 Parasitism, 158 



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