INDEX. 



369 



Muscles of chela, 93 



of stomach, 57 

 Myosin, 186 

 Myotome, 174: 

 My sis, 281, 323 



relicta, origin of, from M. 

 ocnlata, 327 

 Mysis stage of development, 280 



N. 

 Natural History, 3 



Philosophy, 3 

 Nauplius stage of development, 



215, 28a 

 Nearctic province, 314 

 Nephrons, 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 Astacus noliUs 

 Nomenclature, binomial, 13, 15 

 Norway lobster, see Neplirops 

 Novozelanian province, 314 

 Nucleated cell, 199 

 Nucleolus, 187 

 Nucleus, 177, 200 



changes of, in cell-division, 200 



0. 



CEsophagus, 51 

 Olfactory organ, 114 

 Organ, 22 



Origin of crayfish, evidence as to, 

 320, 331 



17 



Ovary, 31, 129 



structure of, 131 

 Oviduct, 129 

 Oviposition, 351 

 Ovisac, 132 

 Ovum, 129 



structure of, 133 



P. 



Paltearctic province, 314 

 Palmmon, 268, 328 

 PaUmiridce 203 

 Palinvrns, 261, 264 

 Palp, 171 



Paraneplirops, 250, 306, 313 

 Paraphragm, 158 

 Parasites of crayfish, 356 

 Parastacidcs, 252, 256, 306, 313 

 Parastacus, 250, 306 

 Pemjphix, 341 

 Penaus, 267, 280 

 Pericardium, 69 

 Perivisceral cavity, 50 

 Phyllobranchia, 271 

 Physiology, 46 

 Pleurobranchia, 79 

 Pleuron, 96, 143 

 Podobranchia, 75, 165 

 Podojflithalmia, 279 

 Pore-canals, 195 

 Post-orbital ridge, 233 



spine, 232 

 Potamohiidce, 252, 256 

 Prawn, see Palcevwn 

 Prehension of food, 49 

 Procephalic lobes, 160 



development of, 213 

 Propodite, 165 

 Protopodite, 143 

 Prototroctcs, 315 



