76 



INDEX 



Cheloniidse, 60. 



Chelydridse, 60. 



Chitin, 55. 



Chiton, 55. 



Chloroplast, 9. 



Chordata, 56. 



Chorophilus, 58 



Chromatin, 10, 20. 



Chromoplast, 9. 



Chromosome, 20, 22, 40, 41, 42. 



Chrysemys marginata, 69. 



Circular canals, of Obelia, 31. 



Circular muscles, of earthworm, 29. 



Circulation, 17. 



Circumpharyngeal connectives, of earth- 

 worm, 29. 



Classes, 56, 57. 



Clavicle, 47; of man, 47. 



Cleavage, of frog's egg, 42. 



Cleavage furrow, 42. 



Cleavage nucleus, in Ascaris, 41. 



Clitellum, of earthworm, 26. 



Cloaca, of frog, 37, 38. 



Cnidoblast, in Hydra, 25. 



Ccecilians, 58. 



Coelenterata, 30, 52. 



Coelom, 53; of earthworm, 27. 



Ccenosarc, 52; of Obelia, 30. 



Color, regional differences of, 69. 



Coracoid, 47; of man, 47; of pigeon, 48. 



Costiform processes, 60. 



Crocodilini, 59. 



Crop, of earthworm, 28. 



Cross-bill, white-winged, distribution of, 

 68. 



Cryptobranchus, 58. 



Cyst, of Monocystis, 33. 



Cytoplasm, 8, 9, 21, 22. 



Daughter individuals, of Volvox, 24. 



Dero, budding in, 34. 



Deserts, 67. 



Desmognathus, 58. 



Development, of frog, 42. 



Devonian, 71. 



Diemictylus, 58. 



Differentiation, 23. 



Digestion, in metazoa, 17; in Parame- 



cium, 14. 



Digestive system, of earthworm, 28. 

 Dioecious, 35. 

 Diploblastic, 52. 

 Diploid, 42. 



Dissosteira, 55. 

 Distribution of animals, 67. 

 Division, of cells, 20. 

 Division of labor, 19, 23, 31. 

 Drawings, 3, 4. 

 Duck, adaptations in, 69. 

 Dyad, in Ascaris, 41. 



Earthworm, 26, 54; reproduction of, 34. 



Echinodermata, 54. 



Ecology, 62. 



Ectoderm, in Hydra, 25, 26. 



Ectosarc, of Amoeba, 11. 



Egg, digestion of white of, 17; maturation 



of, 40; membrane, in Ascaris, 41; of 



frog, 10; of Obelia, 31; of Volvox, 24; 



types of, 38; yolk, 10. 

 Elk, teeth of, 69. 

 Elodea, 9, 13, 66. 

 Embryo, of Ascaris, 41; of Hydra, 26; of 



mammal, in uterus, 38. 

 Embryology, 40. 

 Endoderm, in Hydra, 25, 26. 

 Endosarc, of Amceba, 11. 

 Enzyme, 17. 

 Eohippus, 72, 73, 74. 

 Epistylis, 23, 52. 

 Epithelial cells, in earthworm, 29; in 



Hydra, 25. 

 Epithelium, 14. 

 Equatorial plate, 20, 22. 

 Equus, 73, 74. 

 Erythrosin, 9. 



Esophagus, of earthworm, 28. 

 Euglena, 9, 10, 14. 

 Euplectella, 52. 

 Eutrephoceras, 71. 

 Excretion, in metazoa, 18; in Para- 



mecium, 15. 



Excretory system, of earthworm, 28. 

 Exumbrella, of Obelia, 31. 



Family, 59, 61. 



Fat, 17. 



Fat bodies, of frog tadpole, 44. 



Fauna, of terrigenous bottoms, 62. 



Feathers, 57. 



Femur, 47; of frog, 48; of man, 47; of 



pigeon, 49. 



Fertilization, 38, 39, 40, 41. 

 Fibril, in muscle cell, 16. 

 Fibula, 47; of man, 47; of pigeon, 49. 



