322 
Earthworm, alimentary canal of 
(illus.), 71. 
Ectoblast, 82. 
Ectoderm, 33. 
Egg case of Californian barn-door 
skate (illus.), 140; cockroach (dil- 
lus.), 140. 
Egg cell, 21, 56. 
Egg, fertilized, 35; of bird (illus.), 
79; of butterfly (illus.), 79; of 
fish (illus.), 79; of katydid (il- 
lus.), 79; of skate (illus.), 79; of 
toad (illus.), 79. 
Electric ray, (illus.), 135. 
Embryology, 64. 
Embryonic development, 80; of 
the pond snail, 81. 
Emmydrichthys vulcanus (illus.), 
132. 
Endoblast, 82. 
Endodern, 33. 
Environment, instincts of, 248. 
Epizoanthus pagurtphilus, with 
sea-anemone (illus.), 177. 
Erynnis manitoba, distribution of 
(illus.), 273. 
Eucope (illus.), 42. 
Eudorina, 27. 
Eudorina elegans (illus.), 28. 
Exocetus (illus.), 131. 
Hye of dragon-fly (illus.), 239; of 
jelly-fish (illus.), 238. 
Fauna, 296; bassalian, 305 ; littoral, 
306; pelagic, 304. 
Faunal areas of the sea, 304. 
Feeding habit of Californian wood- 
pecker (illus.), 128, 129 ; of Mela- 
nerpes formicivorus bairditi 
(illus.), 128, 129; instincts of, 
244, 
female, 57. 
ANIMAL LIFE 
Fish, egg of (illus, 79; embry- 
onie stages of (illus.), 87; -louse 
(illus.), 188. 
Fishes, man-of-war (illus.), 175; 
nest-making habits of, 264. 
Fission, 9; binary, 54. 
Flagella, 25. 
Flagellata, 24. 
Flatworm, alimentary canal of 
(illus.), 70. 
Flounder, development of (illus.), 
100; wide-eyed (illus.), 100. 
Flying fishes (illus.), 181. 
Food, adaptations for securing, 
125; necessary to animal life, 
106. 
Form. primitive, 20. 
Fossil, 18. 
Fresh-water animals, barriers af- 
fecting, 294. 
Function, 63. 
Fur seal (illus.), 186. 
Galapagos Islands, animals of 
(illus.), 278; locusts of (illus.), 
280. 
Gull, giant, of white oak (illus.), 
148. 
Galls, insect, on leaf (illus.), 144. 
Gapes, worm which causes, 60 
Gastrula, 82. 
Gemmule, 35. 
Generalization, 66. 
Generation, spontaneous, 51. 
Generations, alternation of, 51. 
Geographical distribution, 272. 
Geometrical larva on branch(illus.), 
209. 
Gerrhonotus scincicauda (illus.), 
204. 
Giraffe (illus.), 126. 
Gizzard, 71, 
