INDEX 



Phylogeny, 13. 



Physalia, gas tissues, 333. 



Physophora, gas tissues, 334. 



Pieris, spinning gland, 417. 



Pigment, 269; of Ammodytes, 274-275; of 

 Cryptobranchus, 274, 276; diffused, 269; 

 of Loligo (chromatophores), 275-278; of 

 Loligo (ink), 272; of Metopus, 274; in 

 nerve cell, 185, 186; of salamander, 271. 



Pigment mantle, light organs, 123. 



Pigment segregated, 270. 



Pinna, 215, 223. 



Pipa, carrying of eggs, 49 2 - 



Pisicola, nidamental cells, 480. 



Pituitary body, 304. 



Placenta, of cat, 496 ; of man, 498. 



Planaria, eye, 231-232. 



Planocera, integument, 359. 



Plasmosomes, 7. 



Plastids, 9. 



Poison gland, of Arachnids, 381 ; of catfish, 

 384; of ground -hornet, 379; of rattle- 

 snake, 384 ; of toad, 403 ; of vertebrates, 



383- 



Poison hairs, of saddle-back larva, 379. 

 Polar body, first, 462 ; second, 462. 

 Polarity (cell), 10. 

 Pollen cells, of Magnolia, 431. 

 Pollen formation, Magnolia, 430-436. 

 Pollen mother cells, 431. 

 Pollen sac, 431. 



Polygordius, nephrostomes, 352. 

 Pontobdella, sucking disk, 413. 

 Porichthys, development of light organs, 138- 



139- 



Postreduction, 426. 



Preformation, 20. 



Premyelocytes, 172. 



Pre-oocyte, of cat, 471. 



Prereduction, 426. 



Pre-spermatogonia, of selachian fish, 437. 



Primordial egg cells, 469. 



Prophase, 25. 



Prostate gland, of mammal, 478. 



Proteids, 3. 



Protoplasm, i. 



Protoplast, i. 



Pseudocyst, 6. 



Pseudopleuronectes, giant nerve cell, 183; in- 

 fundibular gland, 305. 



Pseudostratified epithelium, 46. 



Pterophryne, 7; giant nerve cell, 184; nida- 

 mental tissue, 487. 



Pyrosoma, light tissue, 133. 



Rachis, of feather, 368. 



Radula, of Helix, 290. 



Raja, ampulla, 212; electric tissue, 108; histo- 

 genesis of electric tissue, 113; nidamental 

 tissue, 487; renal bodies, 314; spermato- 

 genesis of, 436-443 ; thyroid gland, 311-312. 



Rana, renal nerve-endings, 196. 



Reducing division, of reproductive chromo- 

 somes, 425. 



Reduction, of pollen cell, Magnolia, 433. 



Reduction, of reproductive cells, 425. 



Reduction divisions, in mouse, 472-474. 



Reflecting tissue, of light organs, 123. 



Remora, adhering organ, 414. 



Renal bodies, 313. 



Reproduction, outline, 418. 



Reproductive cells, 19, 418; development of 

 female form, 453; development of male 

 form, 423; their differentiation, 19; origin 

 of, in the individual, 420; sexual and 

 asexual, 418. 



Respiratory tissues, 319; of Amphitrite, 328; 

 of Crustacea, 324; of dogfish, 326; of 

 fishes, 330; of insects, 324; of man, 322; 

 of mollusks, 322 ; of adult salamander, 321 ; 

 of snail, 323; of Sycotypus, 330. 



Reticular theory, of protoplasm, 3. 



Retina, 226; diagram of human, 257. 



Retinulae, 224. 



Rhabdites, 375. 



Rhabdome, 225. 



Rhopalonema, static tissues, 209. 



Rhyzophysa, gas tissues, 334. 



Rod, visual, 225. 



Sacculus, 220. 



SagMa, stratified epithelium, 45. 



Sarcoblast, 90. 



Sarcolemma, 78-82. 



Sarcomere, 77. 



Sarcoplasm, 76. 



Sarcous element, 77. 



Scale, of fishes, 371. 



Scent gland, of bugs, 406 ; of centipedes, 408 ; 

 of earwig, 405 ; of Julus, 408 ; of skunk, 

 401 ; of toad, 403; of turtle, 402. 



Schilbeodes, poison apparatus, 383. 



Scolia, digestive tissue, 298 ; poison apparatus, 



379- 



Scolophores, or auditory cells, 219. 

 Sebaceous tissues, 394 ; of birds, 395 ; of 



mammals, 394. 

 Secretion, 5. 



Sepia, visual tissue, 251. 

 Serous glands, of bat, 301. 

 Sertoli cell, 423, 430. 

 Seserinus, gizzard and teeth, 289. 

 Sex, determination of, 422, 442, 450; tables 



showing, 4SI-4S2. 

 Sibine, poison hairs, 379. 

 Smooth muscle, 97. 

 Solen, visual tissue, 227-228. 

 Spelerpes, 10. 



Sperm cells, of Volvox, 17. 

 Sperm columns, 423. 

 Spermatic lobule, 423. 

 Spermatid, 425. 

 Spermatocyte, of first order, 424; of second 



order, 424. 



Spermatogenesis, season of, 424; of skate, 436. 

 Spermatogonium, 424; growth of (general), 



429. 

 Spermatophoral gland, 479. 



