344 



COLOUR IN NATURE 



Sepiala, 192 



Sericulus, 245 



Setophaga, 247 



Sexual coloration, 99, 182, 209,210, 



211, 213, 244-246, 252, 253, 



267, 268, 274-277, 279, 2S4, 



302-307, 318, 319 

 selection, 303-306 

 Siphonostoma, 104, 223 

 SipunculuSt loi 



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, 



243-245, 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, loi, 105, 190 

 Thalassicola, phosphorescence of, 16 

 Thecla, 154 



Thrushes. See Turdidse 

 Tomato, pigment of, 69, 72 

 Tortoise-shell limpet. See Acmaa 

 Tridacna, 44, 184 

 Tridacophyllia, the lettuce-coral, 87 

 Trigla gurnardus, 222 



'lyra, 222 

 Trochus, 188 

 Trophidonotus, 237-241 

 Tropicoris, 169 

 Tryphcena, 142 

 Tubifex, 30, 103, 294, 295 



Tunicata, colours of, 42, 207 



phosphorescence of, 1 8 

 Turacin, 49, 50, 209, 253-256 

 Turbellarians, hsemoglobin 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, 110, 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-chlorelte, 76 

 Zoofulvin, 252, 253 

 Zoonerythrin, 251, 252 

 Zoonomyxa violacea, 7J 

 Zoorubin, 255, 256, 278, 280, 281 



Printed by R. & R. Clakk, LiMiTiiP, Edinburgh. 



