344 
COLOUR IN NATURE 
Sepiola, 192 
Sericulus, 245 
Setophaga, 247 
Sexual coloration, 99, 182, 209,210, 
2x1, 213, 244-246, 252, 253, 
267, 268, 274-277, 279, 284, 
302-307, 318, 319 
selection, 303-306 
Siphonostoma, 104, 223 
Sipunculus, ior 
Spectroscope and pigments, 48-50 
Sphinx , 154, 317 
Spiders, 178-183, 200, 201 
Spirographis, 104 
Spondylus, 186 
Sponges, colours of, 78, 79 
Spongilla, 44, 79 
Star-fishes. See Asteroidea 
Stentor, 43, 76, 77 
Structural colours, 8, 14, 15, 98, 
99, 139, 140, 147-149. 153 . 
167-169, 179, 192, 209, 223, 
2 43 _2 45' 266-283 
Structure of feathers, 262-267 
Sun-birds, 267-275, 278 
Symphyllia , 87 
Syngnathus, 223 
Tannin, 48, 61, 67, 71 
Tegenaria, 180 
Terebella, 103 
Tetronerythrin, 79, 251 
Thalassema, 100, 101, 105, 190 
Thalassicola, phosphorescence of, 16 
Thecla , 154 
Thrushes. See Turdidae 
Tomato, pigment of, 69, 72 
Tortoise-shell limpet. See Acmcea 
Tridacna , 44, 184 
Tridacophyllia , the lettuce-coral, 87 
Trigla gurnardus, 222 
lyra , 222 
Trochus, 188 
Trophido?iotus, 237-241 
Tropicoris, 169 
Tryphcena, 142 
Tubifex, 30, 103, 294, 295 
Tunicata, colours of, 42, 207 
phosphorescence of, 18 
Turacin, 49, 50, 209, 253-256 
Turbellarians, haemoglobin in, 30 
pigments of, 96, 97 
Turbo , 188 
Turbobrunin, 189 
Turbot. See Rhombus 
Turdidae, 260, 261 
Uranidines, 208 
Uric acid in butterflies, 48, 150-152 
in mammals, 288 
Vanessa, 176, 177, 312 
Variation in colour, 174-178, 181, 
182, 325 
Vellela, 92, 93 
Virbius, 164 
Vivianite in bones, 27, 224 
Volucella , 172 
Vorticella, 74 
Wandering cells, 109, no, 158, 
220, 231, 241, 293, 297 
Warning colours, 302, 304, 314 
Waste products as pigments, 36-38, 
107-111, 114-116, 156-160, 
169, 220, 232, 237, 292-299 
White pigment, 48, 150 
structural colour, 9, 10, 62, 71, 
247, 248, 288 
Wood-sorrel, markings of petals, 70 
Xanthophyll, 56, 57, 65, 72, 141 
Yellow Cells of Radiolaria, 74 
of sea-anemones, 89-91 
Yellow pigments, 46, 69, 79, 124, 
125, 192, 208. See also Lepi- 
dotic Acid, Lipochromes, and 
Ooxanthine 
Zoo-chlorellae, 76 
Zoofulvin, 252, 253 
Zoonerythrin, 251, 252 
Zoonomyxa violacea, 77 
Zoorubin, 255, 256, 278, 280, 281 
Printed by R. & R. Clakk, Limited, Edinburgh. 
