INDEX. 



291 



PeloLius, 68 

 Periplaneta, 152 

 Perophthalnius, 144 

 Pheidole, 108 

 Phialidium, 85 

 Photichthys, 185 

 Pineal eye, 127 

 Pinnotheres, 51 

 Piscicola, 134 

 Platyarthrus, 207 

 Plesiosaurus, 129 

 Pleuroraona, 189 

 Podophthalmatn, 50, 156 

 Polydesmus, 189 

 Polyophthalmus, 33, 98, 134 

 Pompilus, 58 

 Ponera, 69 

 Pontella, 47, 48 

 Pontinia, 51 

 Poodle dog, 276 

 Pressure-point, 10 

 Prionus, 67 

 Proctotrupida?, 27 

 Pronotum, 67 

 Prosobranchiata, 138 

 Protoplasm, 21 

 Protozoa, 32, 61 

 Pteropods, 87 

 Ptychoptera, 113 



R 



Recognition among ants, 234 



Eeptilia, 127, 130 



Respiration in insects, 35 



Retina, 123 



Rhopalonema, 85 



Rods, auditory, 18, 104, 111, 187 



, olfactory, 55 



, retinal, 124 



S 



Salivary gland, 30 

 Sarcophaga, 111 

 Schizochiton, 145 

 Scolopendra, 155 

 Scopelus, 186 

 Scorpions, 179 

 Sea-anemone, 12, 187 



Sense-hairs. See Hairs 



Sense of direction, 262 



Sense-organs, origin of, 3, 80, 111 



Senses, unknown, 192 



Serolis, 189 



Setaj. See Hairs 



Sex, power of regulating, 262 



Sigh-fc^rgans of, in Vertebrata, 121 ; 

 Cceknterata, 131; Annelida, 133; 

 Mollusca, 137 ; Arthropods, 146 



, sense of, 118 



, three possible modes of, 118 



Silpha, 38, 41 



Sirex, 58 



Skin, termination of nerves in, 18 



Smell, organs of, in Vertebrata, 32 ; 

 Protozoa, 33; Coelenterata, 33; 

 Annelida, 33; Mollusca,34; Arthro- 

 pods, 35 



Smeriuthus, 73 



Solaster, 133 



Sound, organs of, not known in Pro- 

 tozoa or Coelenterata, 61; i\Iol]usca, 

 61 ; Crustacea, 61 ; Insects, 62 



Sphex, 245 



Sphinx, 73, 148 



Sphcerotherium, 74 



Spiders, 74, 146, 155, 170, 178 



Spondylis, 67, 141 



Squilla, 51 



Stag-beetle, 43, 52 



Staphylinus, 50 



Stenobothrus, 62, 63 



Stratiomys, 167 



Syrphus, 69, 170 



Tachytes, 246 



Taste, organs of, in Vertebrata, 19 ; 

 Annelida, 22; Mollusca, 22; Ar- 

 thropods, 23 



Telephorus, 112 



Temperature, organs of, 10 



Tenebrionida, 68 



Tenthredo, 27, 58 



Theridium, 75 



Touch, organs of, in Vertebrata, 7 ; 

 Protozoa, 11; Coelenterata, 11; 

 Medusae, 12 ; Annelida, 13 ; Mol- 

 lusca, 14; Arthropods, 16 



