Index 



Pigment Cells from the Larvae of 

 Amphibians, Observations on, 

 143. 



Pigment formation, 54; effect 

 upon, of food, and of lecithin, 

 54; current theories of, 54. 



Pigment Formation in Amphibian 

 Larvae, The Control of, 53. 



Pigmentation, relation to, of 

 amount of nutrition, 59, 84; 

 effect on, of various kinds of 

 food, 63 ; effect on, of lecithin, 

 73, 84: of organic substances, 

 76; of changes in light, heat, 

 and food, 82. 



Podisus, 483. 



Pogonomyrmex, food for meadow- 

 lark, 433. 



Polar orientation, in spermatocyte 

 of Aneides lugubris, 517. 



Polyorchis campanulata, 308. 

 minuta, 308. 

 penicillata, 307, 308. 

 pinnatus, 307. 



Polyorchis penicillata, methods of 

 " stiidy, 308; structure, 309; 

 manubrium, gonads, tentacles, 

 310; eye-spot or ocellus, 311; 

 peripheral nervous svstem, 

 317; bibliography, 32l'. See 

 also Ocelhis. 



Polyorchis penicillata. The Struc- 

 ture of the Ocelli of, 3o7. 



Pomona College, Marine Labora- 

 tory, 127. 



Pontobdella muricata, 203, 239. 



Porcellis scaber, food of meadow- 

 lark, 346. 



Powder-down, 331, 333, 362. 



Primary, of remiges, 340, 362. 



Protective adaptation, of insects, 

 480, 492. 



Protective coloration, 487. 



Protozoan cell parasites, 39. 



Pterylography, 331. 



Pycnogonida, distribution of, 127; 

 bibliography of, 138; of the 

 West Coast of Xorth America, 

 key to, 131. 



Pycnogonida from the Coast of 

 California with Descriptions 

 of Two New Species, 127. 



Pycnogonum stearnsi, 133. 



Quill, of down feathers, 332; of 

 wing coverts, 344. 



Ramus, of remiges, 340. 



Rana sp., 65, pi. 1, opp. pp. 88, 

 158, 1.59, 162, 163, pi. 7, opp. 

 p. 170; feeding experiments. 



with liver and egg yolk, 61; 

 after removing yolk, 62; ef- 

 fect on growth, of albumen 

 and lecithin, 73; of liver and 

 lecithin, 74; of liver, yolk, 

 and gliadin, 78. 



Rana tadpoles, 80. 



Random movements in leeches, 

 209. 



Rectrices, 350; shaft, vanes, tail 

 feathers, proximal barbules, 

 distal barbules, barbs, 350; 

 downy structure, 363. 



Reduviidae, food for meadowlark 

 432, 483. 



Red-wing, bicolored, 5, 6, 8, 10 

 15, 17, 18, 380, 461. 

 tricolored, 6, 19. 



Regerhinus, 331. 



Remiges, macroscopic structure of, 

 336; calamus, 336; shaft, 337; 

 barbs, 337; inner vane, 338; 

 outer vane, 339; secondaries, 

 340. 

 microscopic structure of, 340; 

 primary, 340, 362; barb, ra- 

 mus, barbules, 340; proximal 

 barbules, 341, 342; distal bar- 

 bules, 341, 342, 343; secondar- 

 ies, 343 ; downy structure, 363. 



Respiratory movements in leeches, 

 212. 



Rheotaxis in leeches, 227. 



Rhythm, diurnal, in leeches, 240. 



Riddle, 0., cited, 56, 57, 38, 63. 



Righting reactions in leeches, 214. 



Ritter, \V. E., 128. 



Roadrunner, 380. 



Robin, western, 380. 



Romanes, G. J., cited, 64, 317, 319. 



Roup, relationship to epithelioma 

 contagiosum, 41 ; development 

 of, in immune fowls, 42. 



Roux, 155. 



Rusk, G. Y., acknowledgment of 

 assistance, 30. 



Rynberk, G. van, 144. 



Sagitfn cfilifuriiicd. n. sp., from the 

 San Diego Region, Including 

 Remarks on its Variation and 

 Distribution, 89. 



Sagitta californica, description of, 

 90; distribution of, 122: col- 

 larette, 91 ; anterior fin, 91 ; 

 posterior fin, 92; vestibular 

 ridge, 92; anterior teeth, 92; 

 posterior teeth, 92; seizing 

 jaws, 92; ovaries, 93; meas- 

 urements, table of, 94-101; 



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