430 



INDEX 



Ncornithcs, classified, 271 



Neosporidia, classified, 26S 



Nephridia, 126; of cartliworni, 119 



Nephrostonie, 126, 127 



Nereis, 175, 214 



Nerve, 114, 116, 229; cranial, 141; spinal, 

 origin by two roots, 142; spinal, 

 roots of, 229 



Nerve cells, illustrated, 114 



Nerve endings, sensory, 163, 164; in 

 cells of cars, 164; in cells of eyes, 164; 

 in cells of olfactory epithelium, 164; 

 in taste buds, 164 



Nerve ring, 139 



Nervous control, 159 



Nervous mechanism of Hydra, 138 



Nervous system, 114, 139; of Annelida, 

 139 ; of Arthropoda, 140 ; oiAsiacusflu- 

 viatilis, 140; autonomic, 163; central, 

 114, 163, 164, 229; centrahzation in, 

 139; in Coelenterata, 139; early de- 

 velopment of, 225; of earthworm, 

 119; of flatworms, 139; of the frog, 

 figure of, 141; functions of, 160; 

 of Limnadia, 140; of Mam squinado, 

 140; of roundworms, 139; sympa- 

 thetic, 141, 163; unit of structure 

 of, 159; of vertebrates, 140-142 



Nervous tissues, 108, 114 



Nests, 198; of birds, 198; of fishes, 198 



Net-knots, 37, 71, 75 



Neural arch, 136 



Neural canal, 136 



Neural crest, 116, 210, 224, 229, 230 



Neural fold, 224, 225 



Neural groove, 223, 224 



Neural spine, 136 



Neural tube, 115, 222 



Neuromuscular cells, 139; in Hydra, 138 



Neuron, 142, 159, 160, 161, 162, 163; 

 activator, 160, 161; motor, 160, 161; 

 sensory, 160, 161 



Neuroptera, classified, 270 



Neutral characteristics, 360 



Neutral red, 56 



Nitella, 61 



Nitrogen, excretion of, 151 



Nomenclature, 264; binomial system of, 

 17, 264; citation of names, 265; 

 codes of, 264 ; rules of, 264 



Normal eye in Drosophila, 345 



Normal wing in Drosophila, 345 



Northern jumping mouse, range of, 292 



Nostril, 231 



Notch wing in Drosophila, 345 



Notochord, 115, 116, 210, 222, 223, 224, 

 225, 228 



Notophthalmus mridescens, copulatory 

 habits in, 192 



Nuclear membrane, 32, 37, 75 



Nuclear sap, 32, 37 



Nucleins, 39 



Nucleolus, 32, 38, 70, 71, 72, 80, 114, 214 



Nucleus, 31, 32, 66, 80, 171, 214; dis- 

 tributed, 32; in muscles, 156, 157; 

 position of, 68; relation to metabolic 

 activities, 66-69; shape of, 31 



Number of chromosomes, 79 



Nutrient substances, 53 



Nutrition, influenced by secretions, 154 



Obeha, 96, 97, 99, 186; budding in, 168, 



169 

 Objectives, 15 

 Oblique illumination, 36 

 Observation, 11 

 Octopods, classified, 273 

 Odonata, classified, 270 

 Odontoceti, classified, 271 

 Odors, glandular secretions, 154 

 CEcology (see Ecology) 

 Qllnothera, 257, 346, 347; as a complex 



heterozygote, 363; mutation in, 345, 



346, 347, 348 

 CEnothera gigas, 347 

 Q!]nothera pratincola, 347, 348; mutation 



formosa, 347; mutation latifolia, 347; 



mutation nunimidaria, 348 

 CEnothera Reynoldsii, mutation bilonga, 



346; mutation debilis, 346 

 Oils, 40 



Oken, 19, 262, 263 

 Oleic acid, 52 

 Olfactory epithelium, 164 

 Olfactory organ, 231 

 Olfactory pit, 227 

 Oligocene, 319, 321, 324, 325; geography] 



of, 318; in time scale, 315 

 Oligochajta, classified, 269 

 Oligochaite worms, 173 

 Onychophora, classified, 270, 273 

 Oocyte, primary, 211, 212, 213; second- 

 ary, 211, 213 

 Oogenesis, 209, 211, 212-213 

 Oogonia, 209, 211, 212 

 Oogonium, 212 



