760 



Rays, fin, 320, 552, 554 



gill, 319 

 Receptaculum ovorum, 173 



seminis, 270 

 Recessive, 681 



Recombination of factors, 684 

 Rectrices, 395 

 Rectum, of cockroach, 233 

 of dogfish, 324 

 of frog, 365 

 of mussel, 276 

 of pigeon, 408 

 of rabbit, 442, 444 

 See also Canal, alimentary 

 Redia, 125 

 Red cat, 176 

 Reduction division, 692 

 Refection, 445 



Regeneration in crayfish, 203 

 in earthworm, 175 

 in Hydra, 102 

 in Turbellaria, 131 

 Regulation, 17 



of circulation, 448 

 of temperature, 191, 454 

 osmotic, 31, 194. 210, 332 

 Relapsing fever, 223, 353 

 Relaxation, 13 

 Remiges, 394 

 Renal. See Artery, Portal system, 



Vein 

 Repeated fission, 38 

 Reproduction, i, 2, 471 

 asexual, 6 

 of Amoeba, 3, 4 

 of Ascaris, 138 

 of Carchesium, 59 

 of Chlamydonwnas , 38 

 of cockroach, 236 

 of crayfish, 216 

 of dogfish, 335 

 of earthworm, 172 

 of Entamoeba, 63 

 of Euglena, 40 

 of frog, 379 

 of Hydra, 99 

 of leech, 183 

 of lancelet, 309 

 of liver fluke, 122 

 of malaria parasite, 69 

 of Monocystis, 44 

 of Nereis, 178 

 of Obelia, 105 

 of Olynthus, 84 

 of Opalina, 61 

 of Paramecium, 51 

 of pigeon, 414 

 of Polytoma, 38 



INDEX 



Reproduction of rabbit, 455 



of snail, 269 



of starfish, 293 



of swan mussel, 278, 281 



of tapeworms, 129, 133 



of Trypanosoma, 67 



of Vorticella, 58 



sexual, 6. See also Life-history 

 Reproductive organs. See Genera- 

 tive organs 

 Reptilia, 549, 551 



blood vessels of, 601 



skull of, 577, 578 



See also Lizard 

 Respiration, 2, 12, 21 



of Amoeba, 30 



of cockroach, 234 



of crayfish, 209 



of dogfish, 325 



of earthworm, 166 



of frog, 376 



of Hydra, 98 



of liver fluke, 121 



of parasites, 154 



of pigeon, 408 



of plants, 21 



of rabbit, 445 

 Respiratory pigments, 190 



system, 588 

 Restiform bodies of dogfish, 336 

 Retia efferentia, 619 

 Reticulum, 594 

 Retina, 465, 534, 535 



origin of, 537 

 Retinal image, 467 

 Retinula, 214 

 Rhabdias bufonis, 146 

 Rhabdites, 131 

 Rhabditis, 136, 141, 142 

 Rhabdonema nigrovenosum, 146 

 Rhabdopleura, 310 

 Rhinal fissure, 460 

 Rhinencephalon, 460 

 Rhinoceros, 490 

 Rhizocrinus, 298 

 Rhizopoda, 80 

 Rhombencephalon, 608 

 Rhynchocephalia, 550 

 Rhynchota, 250 

 Riboflavin, 9 

 Ribs, 567 



cervical, 424 

 of dogfish, 316 

 of pigeon, 402 

 of rabbit, 421, 424, 425 

 vestigial, of frog, 351 

 Rickettsia, 253 

 Rima glottidis, 376 



