INDEX. 



369 



Muscles of chela, 93 



of stomach, 57 

 Myosin, 186 

 Myotome, 174 

 Mysis, 281, 323 



relida, origin of, fror" M. 

 oculata, 327 

 Mysis stage of development, 280 



Ovary, 31, 129 



structvire of, 131 

 Oviduct, 129 

 Oviposition, 351 

 Ovisac, 132 

 Ovum, 129 



structure of, 133 



N. 

 Natural History, 3 



Philosophy, 3 

 Nauplius stage of development, 



215, 280 

 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 Astaciis nohilis 

 Nomenclature, binomial, 13, 15 

 Norway lobster, see Nejilirops 

 Novozelanian province, 314 

 Nucleated cell, 199 

 Nucleolus, 187 

 Nucleus, 177, 200 



changes of, in cell-division, 200 



O. 



ffisophagns, 51 

 Olfactory organ, 114 

 Organ, 22 



Origin of crayfish, evidence as to, 

 320, 331 



Palasarctic province, 314 

 Pahsmon, 268, 328 

 PaUwuridoe 263 

 Palinnrns, 261, 264 

 Palp, 171 



ParanephrojJS, 250, 306, 313 

 Paraphragm, 158 

 Parasites of crayfish, 356 

 Parastacida, 252, 256, 306, 313 

 Parastacus, 250, 306 

 Pempliix, 341 

 Penceus, 267, 280 

 Pericardium, 69 * 



Perivisceral cavity, 50 

 Phyllobranchia, 271 

 Physiology, 46 

 Pleurobranchia, 79 

 Pleuron, 96, 143 

 Podobranchia, 75, 165 

 PodovMhahnia, 279 

 Pore-canals, 195 

 Post-orbital ridge, 233 



spine, 232 

 PotamoMidcB, 252, 256 

 Prawn, see Palcemon 

 Prehension of food, 49 

 Procephalic lobes, 160 



development of, 213 

 Propodite, 165 

 Protopodite, 143 

 Prototroctes, 315 



