262 
INDEX. 
Senses of grasshopper, 40 
Septa of coral, 135 
Serial homology, 107 
Shrimp, 101 
Silicious sponge, 125 
Siphon of mussel, 158 
Skeleton of bat, 222 
“ “ bird, 193 
“ “ chimpanzee, 223 
“ “ fish, 173 
“ “ frog, 193 
“ “ horse, 215 
“ “ man, 194 
Slugs, 7, 162 
Smelt, 169 
Snails, 5, 163 
Snakes, 7 
Somite, 104 
Sow-bug, 5 
Species, 112 
Sperms of hydra, 130 
Spicules of sponge, 125 
Spider, 93 
Spinal cord, 173, 174, 195 
Spinal nerve, 173 
Spinnerets, 94 
Spiracles, 32 
Sponges, 123 
Squash-bug, 61 
Squid, 166 
Starfish, 140 
Sternum, 104 
Stone-lilies, 2 
Stridulating, 41, 42 
Structure and habitat, 240 
Struthii, 207 
Stylets, 43 
Supraoesophageal ganglia, 167 
Survival of fittest, 35 
Swimmerets, 103 
Sympathetic system of nerves, 181 
Synapta, 146 
T 
Tadpoles, 179 
Tanning worms, 148 
Tarsus of insect, 34 
“ “ man, 197 
Teeth of mammals, 231 
Telson, 115 
Tergum, 32, 104 
Thecae, 138 
Thorax of insects, 33 
Thysaneura, 65 
Tibia of insect, 34 
“ “ man, 194 
Tongue of frog, 182 
Trachea of an insect, 38 
Trochanter of insects, 34 
Turtles, 7 
Tympanum, 33 
U 
Unio, 155 
Urostyle, 198 
Urea, 29 
Usefulness of earthworms, 153 
V 
Variation, 251 
Ventricle of fish, 170 
Vermes, 148 
Vertebrata, 174, 254 
Visceral cavity, 174 
Vocabularies of terms applied to 
one-celled animals and sponges, 
126 
coelenterata, 147 
Crustacea, 115 
echinodermata, 147 
insects, 44, 56, 67, 85 
mollusca, 167 
vertebrate animals, 176, 177, 
210, 255 
Vocabularies of general terms fre¬ 
quently used, 31, 100, 255 
W 
Wasps, 5 
Waste, 26 
Water-boatman, 80, 81 
“ fleas, 109 
“ spider, 95 
Web of spider, 95 
Wing of birds, 198 
“ insect, 42 
Winglet, 58 
Z 
Zooids, 132 
Zoology, 30 
