Part 64

Cryptobranchus Allegheniensis, habits, 119 life history, 119

Cryptozoic fauna of Australasia, 144

Cuckoo, behavior, 113 life, 113

Cultivation of turtles, 110

Cycle of matter, in the sea, 87

Cycles, vegetative, causes, 88

Dace, horned, 63

Danish lakes, plankton investigations, 140

Danish waters, ecology of grass-wrack in, 89

Danube and its delta, biology affected by floods, 145

Death feigning, Belostoma (= Zaitha) flumineum Say, 118 instinct, 113 Nepa apiculata Say, 118 Ranatra, 113

Death of lower organisms, 97

Decrease of birds, 124

Describing environments, 45

Descriptive method, 14

Desert species, of Amphibians, 148 of reptiles, 148

Determination, of specimens, 49, 51 of specimens at museums, 52

Determined specimens, series of, 52

Development, 92, 93 ants, 120 effect of environment on mollusks, 100 environment, 45, 46 individual, 97 oysters, 112 optima, 94 problem, 98

Developmental or explanatory method, 14, 15

Digestion in cold-blooded vertebrates, influence of season and temperature, 100

Diptera, aquatic nematocerous, 75 catalogue of North American, 71 North American, catalogue, 71

Directions for collection, 39, 57

Directory, Naturalist’s, 53

Disadvantages of non-ecological surveys, 31

Diseases, mussels, 119

Distribution, fish, 64 Planarians, local, 119 vertically of Chætognatha, San Diego region, 115

Domestic animals, 132 psychic development of young, 115