256 
Paramecium (illus.), 15. 
Parapodium (para, alongside of; 
pous, foot), 60. 
Parasitism, 48. 
Passeres, 223, 
Pelican (illus.), 212. 
Pelicanus erythrorhynchus (illus.), 
212. 
Perea flavescens (illus.), 155. 
Perch, 166. 
Perching birds, 223. 
Peripatus eiseni (illus.), 111. 
Pheasant, 217. 
Physalia (illus.), 37. 
Physiology (physis, the nature of 
a thing; logos, a discussion), 1. 
Pici, 221. 
Piddock (illus.), 75. 
Pigeons, 218. 
Pike (illus.), 164. 
Pill-bug (illus,), 105. 
Pineal gland, 198. 
Planaria (illus.), 45. 
Plants and animals, differences be- 
tween, I. 
Plants, characteristics of higher, 2. 
Plant-lice, 122; in ant-nests, 129. 
Plastron, 188, 
Plover, killdee, 216. 
Polychetes, 59; sedentary (illus.), 
61; development of, 63. 
Polyne brevisetosa (illus.), 61. 
Polyzoa (illus.), 68. 
Porcellio scaber (illus.), 105. 
Porcupine (illus.), 232. 
Porpoise, 284. 
Portuguese man-of-war (illus.), 36. 
Prairie-dog, 233. 
Prawn (illus.), 100. 
Precocial birds, 208. 
Primates, 243. 
Proboscis, of flatworms, 46, 
ANIMAL FORMS 
Procyon lotor (illus.), 240. 
Protoplasin (protos, first; plasma, 
anything molded), 9; structure 
of, 10. 
Protozoa, 11; characteristics of, 
17; colonial, 19. 
Pugettia richii (illus.), 104. 
Pulsating vacuoles, 16, 17. 
Pygopodes, 209. 
Quail (illus.), 217. 
Rabbit, 283. 
Raccoon (illus.), 240. 
Race histories and life histories, 27. 
Radial symmetry, 44. 
Rail, 215. 
Rain-crow, 220. 
Raptores, 219. 
Rat, house-, 233 ; 
musk-, 233, 
Ratite, 209. 
Rattlesnake (illus.), 191. 
Recognition-marks, 203, 
Regeneration, 51. 
Reproduction, sexual and asexual, 
5, 82. 
Reptiles, general characteristics, 
185; distribution, 191; anat- 
omy, 195. 
Retrograde metamorphosis, 99. 
Rotifer (illus.), 66. 
Ruminant, 237. 
wood-, 2838 ; 
Sabella, 62. 
Salamander (illus.), 176; distribu- 
tion, 178; structure of, 179. 
Salmon, 1638. 
Sand-dollar (illus.), 142. 
Sandhopper (illus.), 105, 
Sandpiper, 216. 
Sapsucker, 221, 
