

INDEX 





parasitic wasps, i6, 35, 59, 157 



parental care m birds, 88 



parrots, 12., 14 



peach-nectarine trees, 147 



peccaries, 93 



pelecypods, loi, xzi 



Pelagof/juria, /Z 



Penatis, 149 



peridinians, 96, iio 



Peripatus, i62. 



Phoronidea, i6i, i68, 2.75 



phoronids, 70, 103, 151, 153, 155, 157 



phyllopods, loi, 12.5, 158 



pigmentation in animals, 76 



pilidium, 151 



Piltdown man, 116, 12.7 



Pithecanthropus erectiis, 2.i6 



place of greatest size and abundance of 



sea animals, ^2. 

 Pleistocene or Ice Age, i, 43, 12.6, 170, 



171 > 172-, 176, 177. 2.Z7, ii8, 2.^9 (see 



table on p. 99) 

 plesiosaurs, 107 

 Pliocene, 171, 172., 2.17 (see table on 



P- 99) 

 plover, golden, 81 



plutei, 150 



pollack, 95 



polynoid worms, loi 



Polyzoa, 2.64, 170, ^75 



polyzoans, 67, 70, 102., 151, 153, 155, 



157, 159, 162., 2.56, 157, 2.58, x64 

 Porifera, x65, 2.71 

 porpoises, SG, 67 

 potentiality of the primitive single 



cell, 2.2.0 

 pottos, 2.2.4 



Pre-Cambrian, iiz (see table on p. 99) 

 predacious wasps, 16 

 priapulids, 70, 103, 155 



Priapuloidea, 163, 170 

 Primates, 12.4, 2.17, zz8, ZZ9 

 primitive forms of animal life analyzed, 



104 

 primitive single cell, potentiality of, 



zzo 

 Primnoa^ 153 



Princess Helen's hummingbird, 89 

 problem of evolution, xiii 

 protection of insect societies, 9 

 protochordates, 199 

 Protozoa, zb6, Z71 

 protozoasa, 149 

 protozoans, 35, 51, 59, 69, 104, 15Z, 



194, Z41, Z44, Z71, Z73 

 psychological aspects of eyes, 83 

 pteropods, loz 

 pterosaurs, 107 

 pugs, 147, 184, 186, 187 

 pyro somas, 65, 7Z, z6i 



R 



Rabbits, 145 



radiolarians, z66, Z71 



rat-like rodents, 18 



rats, 7 



ravens, 13 



razor-clams, GG 



red admiral, 86, 131 



redia, 151, Z5Z 



region of greatest amount of life, 5Z, 53 



region of greatest density of life, 54 



region of greatest variety of life, 54, 56 



reindeer, iz6 



relative efficiency of fish, crustaceans 



and protozoans, Z36 

 relative number of kinds of animals on 



land and in the sea, 68 

 relative number of major groups of 



animals on the land and in the sea, 67 



[2-93] 



