INDEX. 



369 



Muscle* of cneiA, 93 



of stomach, 57 

 Myosin, 186 

 Myotome, 174 

 tfysis, 281, 323 



relicta, origin of, 



oculata, 327 

 Mysis stage oi development, 280 



N. 

 Natural History, 3 



Philosophy, 3 

 Nauplius stage of development, 



215, 280 



Kearctic province, 314 

 Nephrops, 259, 332 

 Nerve, 101 



auditory, 117 



optic, 118 

 Nerve-cells, 103, 187 



fibres, 101, 188 

 Nervous system, 105 



development of, 213, 224 



functions of, 354 



Noble crayfish, see Astacvs nobilit 

 Nomenclature, binomial, 13, 16 

 Norway lobster, see Nephropt 

 Novozelanian province, 314 

 Nucleated cell, 199 

 Nacleolus, 187 

 Nucleus, 177, 200 



changes of, in cell-division, 200 



0. 



(Esophagus, 51 

 Olfactory organ, 114 

 Organ, 22 



Origin of crayfish, evidence as to, 

 320, 331 



25 



Ovary, 31, 129 



structure of, 131 

 Oviduct, 129 

 Oviposition, 351 

 Ovisac, 132 

 Ovum, 129 



structure of, 133 



P. 



Palaearctic province, 314 

 Palcemon, 268, 328 

 Palinuridce 263 

 PalinuniJi, 261, 264 

 Palp, 171 



Paranephrops, 250, 306, 313 

 Paraphragm, 158 

 Parasites of crayfish, 356 

 Parastacida, 252, 256, 306, 313 

 Parastacus, 250, 306 

 Pempliix, 341 

 Penceu*, 267, 280 

 Pericardium, 69 

 Perivisceral cavity, 50 

 Phyllobranchia, 271 

 Physiology, 46 

 Pleurobranchia, 79 

 Pleuron, 96, 143 

 Podobranchia, 75, 165 

 Podophthalmia, 279 

 Pore-canals, 195 

 Post-orbital ridge, 233 



spine, 232 



Potamobiida:, 252, 256 

 Prawn, see Palcemon 

 Prehension of food, 49 

 Procephalic lobes, 160 



development of, 213 

 Propodite, 165 

 Protopodite, 143 

 Prototroctet, 315 



