INDEX 



761 



Rodentia, 483, 484 

 Rods and cones, 534 

 Rostellum, 127 

 Rostrum of bird, 403 



of crayfish, 196 



of dogfish, 317 



of lancelet, 300 

 Rough hound, 311 

 Round worms, 134, 141 

 Rumen, 594 



Sacculina, 150, 152, 220, 221 

 Sacculus of ear, 390, 468 



rotundus, 443 

 Saccus vasculosus, 336 

 Sacral vertebrae, 424 

 Sacrum, 352, 400, 425 

 Sacs, air, of pigeon, 409 



lymph, of frog, 349 



scrotal, 418, 455, 527 



sperm, 334, 619 



vocal, of frog, 364 

 Saddle, 158 

 Sagittal crest, 428 

 Salamander, 549 

 Salainandra, 549 

 Saliva, 444 



Salivary glands. See Glands, sali- 

 vary 

 Salmo, 546 

 Salmon, 194 

 Salpingosca, 83 

 Saltatorial locomotion, 484, 485, 



558 

 Salts, inorganic, of the food, 7 

 Santonin, 140 



Saprophytic and saprozoic organ- 

 isms, 41 

 Sarcolemma, 520 

 Sarcoplasm, 521 

 Sarcopsylla, 148 

 Sarcoptes scahiei, 224 

 Sawfiies, 240, 260 

 Scala media, 469 



tympani, 469 



vestibuli, 468 

 Scales, cycloid, 545 



epidermal, of pigeon, 392 

 of reptiles, 528 



of dogfish, 313 



placoid, 313 

 Scaphognathite, 209 

 Scaphopoda, 284 

 Scapus, 395 

 Schistosoma, 127 

 Schizocoele, 634 

 Schizogony, 69, 77 

 Schizont, 69, 74, 77 



Schizozoite, 72, 77 

 SciuYus, 485, 486 

 Schneiderian membrane, 469 

 Sclerites, 201 

 Sclerotic, 316, 465, 536 

 Sclerotin, 227 

 Sclerotome 564, 628 

 Scolex, 127 

 Scorpionidea, 223 

 Scorpion-fly, 254 

 Scrotum, 418, 455, 527 

 Scyliorhinus, 311. See Dogfish 

 Scy Ilium, 311 

 Scyphistoma, 114 

 Scyphomedusae, 112 

 Scytomonas, 41 

 Sea cows, 491 



cucumbers, 298 



gooseberries, 117 



lilies, 298 



urchins, 297 

 Sea-anemones, 115, 147 

 Seals, 489 

 Sebum, 528 

 Secondary body cavity, 190 



remiges, 394 

 Secretin, 471 

 Secretion, 13, 14, 502 



internal, 18 

 Sections of body, 188 

 Segmental plate, 634 

 Segmentation, 192. See also Somites 



of cockroach, 228 



of crayfish, 198 



of dogfish, 312, 313 



of earthworm, 159 



of lancelet, 300 



of leech, 179 



of ovum. See Cleavage 



of tapeworm, 128 



of Vertebrata, 568 

 Segments of body. See 

 Segmentation 



of limbs, 228 



of ovum, 621. See also Blasto- 

 meres 

 Segregation, 684 

 Selenodont teeth, 492 

 Self-fertilisation, 124 

 Self-preservation, 2 

 Sella turcica, 427 

 Semen, 456 



Semicircular canals, 390 

 Semilunar valves of heart of dog- 

 fish, 326 



of frog, 370 



of pigeon, 410 



of rabbit, 448 



