INDEX. 



369 



Muscles of chela, 93 



of stomach, 57 

 Myosin, 186 

 Myotome, 174 

 Mysis, 281, 323 



reUcta, origin of, frc" M. 

 ocnlata, 327 

 Mysis stage of development, 280 



N. 

 Natural History, 3 



Philosophy, 3 

 Nauplius stage of development, 



215, 280 

 Nearctic 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 Astacns nobilis 

 Nomenclature, binomial, 13, 15 

 Norway lobster, see Jfephrops 

 Novozelanian province, 314 

 Nucleated cell, 199 

 Nucleolus, 187 

 Nucleus, 177, 200 



changes of, in cell-division, 200 



O. 



(Esophagus, 51 

 OUactory organ, 114 

 Organ, 22 



Origin of crayfish, evidence as to, 

 320, 331 



Ovary, 31, 129 



structure of, 131 

 Oviduct, 129 

 Oviposition, 351 

 Ovisac, 132 

 Ovum, 129 



structure of, 133 



P. 



Palaaarctic province, 314 

 Palamon, 268, 328 

 J'a.HmiridiB 203 

 J^aliiivrits, 261, 264 

 Palp, 171 



Paranephrops, 250, 306, 313 

 Paraphragm, 158 

 Parasites of crayfish, 356 

 Parastacidai, 252, 256, 306, 313 

 Parastaeus, 250, 306 

 Pemphix, 341 

 Penmus, 267, 280 

 Pericardium, 69 

 Perivisceral cavity, 50 

 Phyllobranchia, 271 

 Physiology, 46 

 Pleurobranchia, 79 

 Pleuron, 96, 143 

 Podobranchia, 75, 165 

 Podoplhthalmia, 279 

 Pore-canals, 195 

 Post-orbital ridge, 233 



spine, 232 

 PotamoUidcB, 252, 256 

 Prawn, see Palcemon 

 Prehension of food, 49 

 Procephalic lobes, 160 



development of , 21 3 

 Propodite, 165 

 Protopodite, 143 

 Prototroctes, 316 



