4oo 



INDEX 



Rocky Mountain locust, 12, 13, 18 



Rodentia, 216, 217 



rostrum, 84 



round worms, 122-124 



rudimentary organs, 343-346 



ruminants, 220 



Sacculina, 96, 97, 365 



sacrum, 290 



salamanders, 169, 170, 364 



salivary glands, 248 



salmon, 162, 163 



salts, 256 



San Jose scale, 37 



sand dollars, 112 



saprophytes, 144 



Sarcodina, 141, '146-148 



scale bugs, 36-38 



scales, 159, 176, 177, 183 



scallop, 102 



scapula, 290 



sclerotic, 306 



scorpions, 76, 81 



screw worm, 42 



sea anemones, 130, 136 



sea cows, 226, 227 



sea cucumbers, 112 



sea-horse, 167 



sea-lions, 224, 225 



sea urchins, 110-112 



seals, 224, 225 



Sebaceous glands, 283, 284 



segments, 126 



semicircular canals, 310 



sensations, 294, 297, 304-310 



sense organs, 304-310 



sensory nerves, 296-298 



septa, 116 



serum, 260, 283 



setae, 115 



seventeen-year cicada, 35 



sexual selection, 195, 196 



sharks, 164, 165 



sheep, 220, 223 



shell, 98 



shrews, 216 



shrimps, 90, 91 



silk- worm moth, 26, 27, 149 



Silurian period, 349 



sinuses, 88 



siphon, 99, 102, 106 



Siphonaptera, 49 



Siphonophores, 135 



Sirenia, 226 



skates, 164, 165 



skeleton, 188, 287-291 



skin, 277, 279, 283-286 



skull, 1 60, 289 



skunk, 210 



sleep, 303 



sleeping sickness, 146 



smallpox, 325, 328 



smell, 3, 209, 210, 305 



snails, 98, 103, 104 



snakes, 176 



sneezing, 299 



sodium, 234, 236 



somites, 84 



sow bugs, 94 



species, 17, 18, 341, 342 



Spencer, H., 313 



sperm cells, 160, 333, 334 



spermaceti, 226 



spermaries, 9, 10 



spermatozoa, 333, 334 



of earthworm, 118, 140 



of fishes, 1 60 



of grasshopper, 10 



sphinx moths, 27, 28 



spiders, 76-81 



spiracles, 5 



sponges, 130, 138, 139, 140 



Spongilla, 140 



spores, 141, 147, 148, 331 



Sporozoa, 141, 148-150 



sports, 356 



squash bug, 31 



