376 



INDEX 



Nematocysts, Hydra, 60, 61, 62; 

 Obelia, 70, 72 



Nephridia, Earthworm, 91, 92 ; modi- 

 fied, in Clam, 146 



Nephrostome, 91 



Nereis, 83 



Nerve cells, afferent, 97; Earth- 

 worm, 96 ; efferent, 97 ; Frog, 

 214; Hydra, 58; motor, 97; 

 sensory, 97 



Nerve cord, Bee, 133; Chordata, 

 149; Crayfish, 110, 111; Earth- 

 worm, 95, 96 ; Grasshopper, 123 



Nerve net, 61 



Nerve rings, 70, 79 



Nerves, afferent, 97, 213; cranial, 

 211 ; efferent, 97, 213 ; medullated, 

 215; motor, 213; non-medul- 

 lated, 215; ramus communicans, 

 215; sensory, 213; spinal, Frog, 

 213 



Nerve tissue, functions, 58 ; his- 

 tology, 214; histology, laboratory, 

 349 



Nervous system, 15 ; Bee, 133 ; 

 Chick, development, 234; Clam, 

 147; Crayfish, 110-112; Earth- 

 worm, 95-97; Frog, 208; Frog 

 development, 225; functions, 58, 

 220; Grasshopper, 123; Hydra, 

 58 ; Starfish, 79, 80 



Neural arch, 178 



Neural canal, 178, 208 



Neural spine, 178 



Neural tube, 149, 209, 226 



Neurilemma, 214 



Neurochords, 96 



Neuromotor apparatus, Paramecium, 

 47 



Neurones, 96 {see Nerve cells) 



Nomenclature, Binomial, 27 



Nostrils, 165 {see Nares) 



Notochord, 149, 150, 152, 154, ]55, 

 225, 227 



Nuclear material, Bacteria, 12 ; re- 

 organization, 25, 44-46, 51 



Nuclear membrane, 6 



Nucleolus, 6 



Nucleus, 5 ; Amoeba, 20 ; Bacteria, 

 12 ; Euglena, 30 ; gametic, 46 ; 

 Mold, 13; Paramecium, 40; Vol- 

 vox, 36 ; Vorticella, 49 ; Yeast, 13 



Nuptial flight, 131 



Nutrition, Amoeba, 22; Bacteria, 

 13; Bee, 128, 133, 136; Chick 

 embryo, 236; Clam, 142; Cray- 

 fish, 104; Earthworm, 85; em- 

 bryonic, 231, 236, 237; Euglena, 

 31 ; Frog, 187 ; Frog embryo, 231 ; 

 holophytic, 9-12, 31, 32, 36, 63 {see 

 Photosynthesis) ; holozoic, 22, 31 ; 

 Hydra, 62 ; Mammal embryo, 237 ; 

 Obelia, 71 ; Paramecium, 42 ; 

 Pleurococcus, 1 1 ; saprophytic, 

 31 ; saprozoic, 31 ; Spirogyra, 11 ; 

 Volvox, 36 ; Vorticella, 50 ; Yeast, 

 13 



Nutritive polyps, 68, 69 



Nymph, 122 



O 



Obelia, description, 68-73, 141; 

 laboratory, 271 ; life processes, 71- 

 73 ; structure, 68-71 



Occipital condyles, 175 



Occipito-vertebral arteries, 195 



Ocelli, 114, 124 



Octopus, 139, 148 



Oesophagus, Bee, 128; Clam, 142; 

 Crayfish, 104; Earthworm, 85; 

 Frog, 182, 185; Grasshopper, 118 



Olfactory lobes, 209 



Olfactory nerves, 209, 211 



Olfactory organs, Bee, 134; Cray- 

 fish, 111; Frog, 216 



Ommatidia, Bee, 134 ; Crayfish, 112 ; 

 Grasshopper, 114 



Onion, root tip, 4 ; laboratory, 247, 357 



Oogenesis, laboratory, 355 



Operculum, Fish, 156 ; Frog, 231 



Opossum, 160 



Opsonins, 200 



Optic lobes, 209 



Oral lobes, 70 



Orbits, 165, 218 



Order, 27 



Organ of Corti, 218 



Organ systems, Earthworm, 84; 

 Bee, 128; Clam, 140; Crayfish, 

 104; Frog, 184; Grasshopper, 

 117; Starfish, 76 



Organization, cellular, 3 



Organs, derivation of, 228 



Osculum, 54 



Osmosis, 7, 31 



