INDEX 



s>^^ 



reproduction, asexual, 155, 156, 157, 



158, 159 



i-eproductive cells compared with pro- 

 tozoans, 51 



reptiles, i, 6, 45, 50, 78, 80, 88, 89, 103, 

 106, 107, 116, 167, 170, 178, 181, 

 181, izi, izi, 2.^3, 2.61 



reversed varieties, 144 



Khabdopleura, i6i 



rhinoceros, 43, zi8 



rhinoceros, woolly, 91 



rhinoceros mice, 145, xi9 



Rhopalura, 2.43 



robber-flies, 35 



robins, 13, 81 



rock disintegration, 38, 53 



rodents, 7, 14, 15, 16, 17, 18, lo, iz, 



2-3, 2.17. 2.3Z, Z33 

 Rotifera, Z64, z7o 

 rotifers, 59, 103, 149, 150, 153, 158, 



Z55, Z56, Z64, Z74 

 round-worms, 103 

 rusts, 40 



Safeguards preventing undue increase 



of animals, xii 

 salamanders, 46, 50 

 salps, 7Z, 76 

 saber -toothed tigers, 93 

 Sardinian swallowtail, 141 

 scallops, 78 

 scaphopods, zoz, zzi 

 scorpions, z6z 

 sea-anemones, 15Z, 194, Z35, Z39, Z53, 



Z65 

 sea-animals, 4Z 

 sea-birds, 17, 66 

 sea-butterflies, z6z 



sea-cucumbers, 7Z, izi, 1Z5, 150, i8z, 



ZOZ, ZZI, Z63, Z64 

 sea-fans, 66, Z65 

 sea-lilies, 7Z, izi, 148, 153, i8z, zoi, 



Z63 

 seals, 50, 67, 167, 181 

 sea-mosses, 66 

 sea-peaches, 7Z, z6i 

 sea-pens, 66, 78, Z39, Z65 

 sea-squirts, 66, jz, z6i 

 sea-turtles, 107 

 sea-urchins, 67, 71, 78, loz, izi, 150, 



153, i8z, ZOI, ZZI, zb3 

 sea-walnuts, 103, Z65 

 sea-worms, 98, z6z 

 serial dependent family, 6, 11, zo, zz 

 sexual development in butterflies, 141 

 shipworms, z6z 

 short-faced bears, 93 

 short-faced pigs, 147 

 shrews, 14, 35 

 shrimps, 149, Z63 

 sight and migration in birds, 81 

 Silurian, 108, 109, iiz (sec table on p. 



99) 



silky fowl, 145 



single-celled animals, 19Z, Z35, Z36, 



2-37. 2.39, z66 

 sipunculids, 70, 103, Z55, Z56 

 Sipunculoidea, z6z, z68 

 skippers, zoz 

 slime-eels, i6z 

 slugs, 41, 63, z6z 

 small red bat, 83 

 snails, 41, 63, 78, i6z, i8z, z6z 

 snakes, 35, 48, 50, 167, 178, i8z 

 snowflakes, 49 

 social insects, 8, 18 

 social system, human, zz, z8 

 social system of insects, 8, zz 



[2-34] 



