696 



INDEX. 



Scombridse, 577 



Scops, 617 



Scorpionida, 447 



Sculpin, 577 



Scutellum, 489 



Scutibranchia, 378 



Scutigera, 461 



Scutigeridse, 461 



Scutum, 424 



Scyphomedusse, 245 



Scyphopolyp, 230 



Scyphostoma, 245, 246 



Scyphozoa, 245 



Sea anemones, 251, 259 



Sea cucumbers, 346 



Sea fans, 259 



Seahorse, 578 



Sea lion, 648 



Sea pens, 259 



Sea otter, 647 



Sea snakes, 601 



Sea squirts, 505, 508 



Sea urchin, fertilization of, 149 



Sea urchins, 343 



Sea whips, 259 



Seals, 648 



Secodont teeth, 626 



Secondaries, 604 



Secondary bones, 515 



Secreta, 73 



Sedentaria, 313, 453 



Segmental organs, 116, 308 



Segmentation cavity, 155 



Segmentation of egg, 149, 151 



Segments of head, 536 



Selachii, 570 



Selection, artificial, 43 



Selection, natural, 44 



Selection, sexual, 46 



Selenodont teeth, 626 



Semaeostomae, 250 



Semicircular canals, 128, 542 



Semilunar valves, 567 



Semipalmate foot, 614 



Semiplumes, 604 



Sensations, 125 



Sense organs of vertebrates, 537 



Senses, 125 



Sensory epithelium, 73, 82 



Sensory organs, 125 



Sepia, 386, 388, 395 



Septibranchiata, 368 



Septum, 306 



Sericteria, 494 



Serosa, 473 



Serpulidae, 313 



Serranidse, 577 



Serripes, 368 



Sertularia, 242 



Serum, blood, 88 



Sesiidae, 495 



Seventeen-year locust, 489, 490 



Sexual cells, 143 



Sexual epithelium, 78 



Sexual glands, 78, 80 



Sexual organs, 80, 117 



Sexual organs of vertebrates, 550 



Sexual reproduction, 142, 145 



Sexual selection, 49 



Shad, 576 



Shagreen, 569 



Sharks, 571 



Sheath of Schwann, 96 



Sheep, 642 



Sheep tick, 493 



Shell gland, 411 



Shell, layers of, 361 



Ship worms, 368 



Shore crab, 437 



Shoulder blade, 528 



Shoulder girdle, 527 



Shrews, 637 



Shrimp, mantis, 429 



Shrimp, opossum, 428 



Siala, 616 



Sialidse, 482 



Sialis, 482 



Sicyonia, 434 



Siderone, 47 



von Siebold, 18 



Silenia, 368 



Silicispongise, 226 



Siliqua, 367 



Silkworms, 495 



Silurian, 180 



Siluridae, 576 



