696 



INDEX. 



ScombriJfe, 577 



Scops, 617 



Scorpionidu, 447 



Sculpin, 577 



Scutellum, 489 



Scutiljranchia, 378 



Scutigera, 461 



Scutii^'eridre, 461 



Scut\im, 424 



Scypliomeduste, 245 



Scypliopolyp, 230 



Scyphostoma, 245, 246 



Scyphozoa, 245 



Sea anemones, 251, 259 



Sea cucumbers, 346 



Sea fans, 259 



Sea horse, 57S 



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, 30S 



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 



Sem?eostomce, 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 



SerpulidsE, 313 



Serranids, 577 



Serripes, 368 



Sertularia, 242 



Serum, blood, 88 



Sesiidse, 495 



Seventeen-year locust, 489, 490 



Se.xual 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 



Siirimp, opijssum, 428 



Siala, 616 



Sialidce, 482 



Sialis, 482 



Sicyonia, 434 



.Siderone, 47 



v(.)n Siebold, iS 



Silenia, 368 



Silicispongia:, 226 



Siliqua, 367 



Silkworms, 495 



Silurian, 180 



Siluridce, 576 



