INDEX. 



Sand-cakes, 289 



Sand-dollars, 289 



Sapajou, 123 



Sauropsida, 85 



SaururaB, 75 



Savigny's law, 158 



Sawfish, 22 



Sawflies, 188 



Scale-bugs, 198 



Scales, 33. 64, 71, 98 



Scallops, 260 



Scansores, 81 



Scaphopoda, 277 



Scapula, 99, 133 



Scarabseans, 186 



Sciatic nerve, 96 



Sclerotic coat, 139 



Scomber, 29 



Scorpions, 229 



Scratching-birds, 78 



Sculpin, 29 



Scutellae, 68 



Scyphomedusse, 304 



Scyphozoa, 301, 311 



Sea-anemones, 301 



Sea-bass, 29 



Sea-cows, 113 



Sea- cucumbers, 292 



Sea-fans, 303 



Sea-horse, 31 



Sea-lilies, 295 



Sea-lion, 122 



Sea-peach, 156 



Sea-pear, 156 



Sea-squirt, 156 



Sea-urchin, dissection of, 282 



Sea-urchins, 288 



Sea-whips, 303 



Seal, 121 



Segmented animals, 330 



Segments, 157, 170 



Selachii, 21, 37 



Semicircular canals, 19, 138 



Semilunar fold, 139 



Sensation, 329 



Sense-organs of vertebrates, 187 



Sensory nerve, 135,136 



Sepia, 264, 268 



Septa, 297 



Serpent-stars, 293 



Setae, 235 



Seventeen-year locust, 197 



Shad, 26 



Sharks, 21 



Sheath of notochord, 128 



Sheep, 120 



Sbeepshead, 29 



Shell, 258 



Shell-gland, 208 



Shellac, 198 



Ship- worm, 263 



Shoulder-blade, 45 



Shoulder-girdle, 45, 132 



Shrews, 109 



Shrimp, 165 



Silicea, 317 



Silkworms, 202 



Silver-bottom, 113 



Silver-fish, 218 



Simple eyes, 173 



Singing-birds, 82 



Siphon, 249, 252 



Siphonata, 263 



Siphonoglyphes, 296 



Siphonophora, 307 



Sirenia, 113 



Skates, 21,22 



Skeleton of vertebrates, 127 



Skippers, 203 



Skull, 130 



Skunk, 121 



Slugs, 277 



Sloth, 106 



Snails, 273, 277 



Snake, glass, 61 



Snake, study of, 58 



Snakes, 67 



Snipe, 80 



Somites, 157, 170 



Sow-bug, 162 



Sparrow, 84 



Spatangoids, 289 



Spermaceti, 112 



Spermatozoan, 331 



Sperm-whale, 112 



Sphex, 190 



Sphinx-moths, 202 



Spicules of sponge, 314, 316 



Spiders, 230 



Spinal accessory nerve, 94 



