INDEX 



493 



Reproduction, Hydra, 154 



monoecious, 153 



parthenogenetic, 154 



Planaria, 154 



Protozoa, 11 

 Reptiles, 451 

 Reptilia, 451 

 Respiration, 45, 139 

 Respiratory movements, frog, 34 

 Reticulitermes, 430 

 Reticulum, 98 

 Retina, frog, 257 



human, 195 



insect, 192 

 Retractor bulbi, 28, 197 

 Rhabdites, 51, 399 

 Rhabdocoelida, 400 

 Rhabdome, 191, 193 

 Rhabdopleura, 441 

 Rhineura, 451 

 Rhizopoda, 370 

 Rhodopsin, 197 

 Rhomboidichthys, 334 

 Rib, frog, 60 



hemal, 63 



pleural, 63 

 Rickets, 110 

 Roaches, 429 



ommatidium of, 192 

 Rodentia, 455 

 Rods of retina, 194 

 Rotatoria, 409 

 Rotifers, 409, 419 

 Ruffini, corpuscle of, 188 

 Rumen, 98 



S 



Sacculus, 199 



Sagitta, 414 



St. George, La Vallette, 19 



Salamanders, 449 



color adaptation of, 326, 327, 333 

 Salienta, 450 

 Salivary digestion, 111 

 Salivary glands, 94 

 Salmon, 449 

 Salpa, 442 



Samia, 431 

 Sand dollars, 439 

 Saprophytic nutrition, 370 

 Sarcocystis, 380 

 Sarcodina, 370 

 Sarcolemma, 83 

 Sarcomere, 84 

 Sarcoptes, 422 

 Sarcostyle, 83 

 Sartorius muscle, 78 

 Sawfish, 447 

 Sawflies, 432 

 Scala media, 199, 202 

 Scales, 49, 50, 90, 448 

 Scaphopoda, 434 

 Scapula, frog, 66 



human, 67, 68 

 Sceloporus, 451 

 Schleiden, M. J., 13 

 Schwann, T., 13 

 Schweigger-Seidel, O., 19 

 Sclera, 193 

 Sclerotic coat, 257 

 Scolex, 404 

 Scolopendra, 424 

 Scute, 448 

 Scyphozoa, 396 

 Sea cucumber, 440 

 Sea lily, 437 

 Sea lion, teeth, 91 

 Sea pork, 442 

 Sea urchin, 439 

 Sebaceous gland, 47 

 Secondary sexual characters, 216 

 Sedimentary rock, 302 

 Segmentation, 420 

 Segmentation cavity, 247 

 Selection, artificial, 296-298 



efficacy of, 321 



hypothetical effect of, 318 



natural, 313 



pure line, 321, 322 

 Semimembranosus muscle, 81 

 Seminal receptacle, 158 

 Seminal vesicle, 157, 159 

 Semitendinosus muscle, 80 

 Sensation, 165 

 Sense organs, 186 



