INDEX 



465 



Preputial glands, 126 



sac, 303 

 Pressure, 395 

 Presternum, 153 

 Primates, 20, 23, 34, 137 

 Primitive streak, 54, 55 

 Proboscidians, 136 

 Process articular, 150 



costal, 152 



ensiform, 154 



spinous, 149 

 Progestin, 327 

 Pronephros, 294, 315 

 Prosencephalon, 348 

 Prostate gland, 314 

 Protection of eggs, 31 

 Proterostomians, 3 



Protochordates, 129, 231, 246, 299, 430 

 Protocone, 133 

 Protoconid, 133 

 Protonephridia, 291 

 Protoplasm, 85 

 Protozoa, 3, 22, 215, 290, 297 

 Psalterium, 231 

 Pulmonary system, 253-261 



veins, 284 

 Pulp cavity, 139 

 Pyloric gland, 228, 231 

 Pylorus, 228 



R 



Rami, 173 



Ranvier, nodes of, 99 

 Raphe, 312, 323 

 Receptor neurons, 97 

 Rectum, 234, 235 

 Renal columns, 304 

 corpuscle, 71 

 ducts, 307 

 organs, 315 

 pyramids, 304 

 sinus, 304 

 tubules, 304 

 Rennin, 230 



Reproduction, 26, 36, 38 

 Reproductive organs, 50, 320-323 

 Reptile(ia), 17, 23, 31, 33, 42, 48, 49, 54, 

 78, 117, 118, 129, 131, 132, 148, 

 153, 157, 162, 164, 167, 172, 180. 

 181, 202, 222, 228, 236, 271, 273, 

 297, 300, 331, 359, 361, 367, 369, 

 402, 403, 418 



Reptile eggs, 28 



Respiratory s>'stem, 170, 245-261 



Reticulum, 231 



Retina, 411 



Ribs, 146, 152, 153 



Rodent(ia), 19, 23, 136 



Roof plate, 385, 386 



Rotifera, 22 



Rumen, 231 



Ruminants, 231 



Sacrum, 151 

 Salivary glands, 221 

 Scala media, 421 

 Scales, 116, 117 

 Schwaun, sheath of, 98 

 Scrotal swellings, 323 

 Scrotum, 311 

 Sebaceous glands, 126 

 Secondary sense cells, 340 

 Secretin, 325 

 Secretory glands, 92 

 Segmentation, 52 

 Seminal vesicles, 313 

 Sense organs, 393-426 

 Sensory nerves, 352, 389 



neurons, 393 



processes, 394 

 Sertoli cells, 312 

 Serum, 107, 263 

 Sexes, 5, 12, 26, 296-323 

 Sexual maturity, ^^ 



reproduction, 297 

 Shank, 186 

 Sheath, medullary, 98 



Schwann's, 98 

 Shells, 116 

 Shoulder girdle, 146 

 Sight, 393, 406-415 

 Sigmoidal curve, 149 

 Sinanthropus Pekinensis, 24 

 Sigmoid colon, 235 

 Single cell organisms, 215 

 Skeleton, 50, loi, 145-190 



appendicular, 146 



axial, 146 



parts, 145 



system, 145 



tissue, 147 



visceral, 158 



