INDEX 



567 



reduction of limbs, 165, 166 



reduction of teeth, 277 



Reissner's membrane, 492 



renal corpuscle, 373 



reproduction by fission, 4 



reproductive system, 378-405 



reptiles, 44, 172, 201, 203, 212, 220, 

 229, 248, 253, 255, 268, 272, 280, 

 296, 328, 330, 331, 352, 353, 355, 

 356, 358, 375, 377, 385, 386, 399, 

 409, 415, 4i6, *I9, 425, 426, 465, 

 472, 487, 488, 504 



respiration, 301-316; in amphibians, 

 306-308, 312-313; in Amphioxus, 

 304; in Balanoglossus, 304; in 

 fishes, 304, 305, 306; integumen- 

 tal, 308; intestinal, 303; pharyn- 

 go-oesophageal, 308 ; pulmonary, 

 307, 310-316 



reticulum, 292 



retina, 409, 422, 497, 498 



retrolingual glands, 286 



rhinencephalon, 416, 445 



Rhineura, 20 



Rhinoceros, 394 



rhombencephalon, 427 



Rhynchocephalia, 32 



ribs, 126, 135, 136, 137, 138; distri- 

 bution of, 137, 138; two types of, 

 135, 137; variation in, 129, 130 



rodents, 37, 45, 175, 203, 223, 239, 

 274, 277, 297, 298, 316, 394, 401, 

 417, 480, 495, 500 



roots, of nerves, 435 



roots, of teeth, 273, 274 



rods and cones, of retina, 422, 467, 

 498 



rods of Corti, 492 



rostral plates of skull, 146 



round ligament of uterus, 387, 390 



rumen, 292 



ruminants, 292, 297, 484 



sacculus, 487, 488 

 saccus endolymphaticus, 486 

 sacral vertebrae, 129, 130 

 sacrum, variation in, 128, 129 

 St. Hilaire, his theories, 506, 512 

 salamanders, 179, 185, 186, 192, 220, 



223, 307, 3o8, 309, 354, 383, 388, 



397, 429, 493 



saliva, 285 



salivary glands, 285 



Sauropsida, no, 200, 264, 283, 284, 

 285, 294, 296, 313, 314, 319, 322, 

 323, 324, 347, 36o, 373, 375, 377, 



391, 444, 457, 464, 479, 491, 495, 

 497, 499 



scales : ctenoid, 83 ; cycloid, 83 ; 

 epidermic, 84; of fishes, 80; of 

 ganoids, 81 ; of mammals, 85, 86, 

 90; of palmar and plantar sur- 

 faces, 95; of Stegocephali, 84; 

 placoid, 80; structure of, 80 



Scaphyrhynchus, 171 



schizocoele, 68 



sclerotic coat, of eye, 423, 498, 501 



scorpion, 524 



scrotal raphe, 404 



scrotal sac, 395, 396 



scrotum, 394, 395 



sculpin, 419 



scutes, 79, 83, 146 



seal, 282, 316 



sebaceous glands, 113 



segmentation of head, 458, 460, 461 



selachians, 29, 44, 152, 153, 170, 172, 

 173, 184, 185, 217, 218, 219, 253, 

 272 288, 305, 324, 325, 326, 327, 

 328, 340 341, 369, 38o, 381, 382, 



392, 416, 419, 420, 436, 460, 486, 

 488, 489, 490, 512, 515 



selachians, circulation in, 324, 325 



selachians, skull of, 145, 146, 153 



sella turcica, 424 



semicircular canals, 487 



seminal fluid (see spermatic fluid) 



seminal groove, 399 



sensations, 467, 468 



sense of contact, 468 



sense-organs, 408, 465-468 



sense-organs, accessory parts, 467 



sense-organs, cells of, 466 



sense organs of head, 143 



sensory cells, 408, 466, 467 



sensory nerves, 408, 434 



sensory roots of nerves, 435, 436 



septum atriorum, 354 



septum linguae, 285 



septum pellucidum, 418 



serial homology of limbs, 178, 237- 



245 



serosa, 260 



