434 



INDEX. 



Scales of fishes, 23, 317 



Scallops, 205 



Scansores, 360 



Scaphognathite, 69 



Scaphopoda, 201 



Scapula, 37, 296 



Scarabaeans, 252 



Sciatic nerve, 36, 63 



Sciatic plexus, 63 



Sclerotic, 304 



Scolex, 181 



Scomber, 332 



Scorpionida, 232 



Scorpions, 232 



Scutellse, 347 



Scyphomedusse, 173 



Scyphozoa, 169 



Sea-anemone, dissection of, 120 



Sea-anemones, 169, 171 



Sea-bass, 332 



Sea-cows, 380 



Sea-cucumbers, 282 



Sea-horse, 334 



Sea-lilies, 279 



Sea-lions, 390 



Sea-peach, 289 



Sea-pear, 289 



Sea-snake, 348 



Sea-squirt, 289 



Sea-urchin, 115,280 



Seals, 388 



Secondary feathers, 48 



Sedentaria, 185 



Segmented animals, 404 



Segments, 67 



Semicircular canals, 302 



Semilunar fold, 303 



Sensation, 401 



Sensory nerves, 298 



Sepia, 209, 212 



Septa, 93, 121, 169, 183 



Serpent stars, 278 



Setae, 92, 185 



Seventeen-year locust, 259 



Sexual dimorphism, 407 



Sexual reproduction, 405 



Shad, 329 



Sharks, 323 



$heep, 387 



Sheep-bot, 269 

 Sheepshead, 332 

 Shell of molluscs. 194 

 Shellac, 261 

 Shell-gland, 218, 220 

 Ship-worm, 207 

 Shore-crab, 229 

 Shoulder-girdle, 37, 296 

 Shrews, 376 

 Shrimp, 227 

 Silicea, 160 

 Silkworms, 265 

 Silurian period, 413 

 Silver-fish, 243 

 Sinus venosus, 18 

 Siphon of Acephala, 202 

 Siphon of squid, 103, 208 

 Siphonal cartilages, 104 

 Siphonata, 207 

 Siphonoglyphe, 120 

 Siphonophore, 164 

 Siphons of clam, 99 

 Sirenia, 380 

 Skate, 323, 324 

 Skeleton of frog, 37 

 Skeleton of turtle, 45 

 Skeletons, making of, 32 

 Skippers, 265 

 Skull of bird, 51 

 Skull of frog, 38 

 Skunks, 388 

 Sloths, 373 

 Slugs, 201 

 Smallpox, 152 

 Snails, 201 

 Snake, study of, 47 

 Snakes, 347 

 Snipe, 359 

 Snout-beetle, 250 

 Soft-shell crab, 228 

 Somites, 67, 183, 215 

 Sonoran region, 411 

 Sow-bug, 229 

 Sow-bug, study of, 73 

 Spanish flies, 253 

 Spatangoids, 282 

 Specialization, 145 

 Species, 143 

 Spermaceti, 379 



