xvm LIST OF ILLUSTRATIONS 



FIGUKE PAGE 



26. Stages in the Development of the Prawn, Peneus potimirium 119 



27. Later Stages in the Development of the Prawn, Peneus 



potimirium 119 



28. Metamorphosis OF A Barnacle, Z,e/7a5 120 



29. Embryos in Corresponding Stage of Development of Shark, 



Fowl, and Man 126 



30. Total Geologic Time Scale 139 



31. Feet and Teeth in Fossil Pedigree of the Horse .... 143 



32. Four Stages in the Evolution of the Cameline Skull . . 145 



33. Four Stages in the Evolution of the Cameline Fore Foot . 146 



34. Evolution of Head and Molar Teeth of Mastodons and 



Elephants 148 



35. Skull of Java Ape-Man, Pithecanthropus ereclus 158 



36. Jaws of Man and of the Apes 159 



37. Restoration of Prehistoric Men 161 



38. Neanderthaloid Skull of La Chapelle-aux-Saints . . . 162 



39. Skeleton of Neanderthal Man 163 



40. Fierasfer acus, Penetrating the Anal Openings of Holo- 



thurians 203 



41. A'c//mo, the "Dead-Leaf Butterfly" 209 



42. Three Aquatic Types of Vertebrate, to Illustrate Con- 



vergent Adaptation 212 



43. Diagram OF A Cell, Showing Various Parts 304 



44. Diagram Showing Representative Stages m Mitotic or 



Indirect Cell-Division 305 



45. Germ-Cell Set Apart in the Eight-celled Stage of Cleav- 



age IN Miaslor americana 308 



46. Chromosomes OF THE Mosquito AND of the Fruit Fly . . .310 



47. Dlagram TO Illustrate Spermatogenesis 311 



48. Diagram to Illustrate Oogenesis , . . ' 312 



49. Diagram Showing the Parallel between Maturation of the 



Sperm Cell and Maturation of the Ovum . . . . . 313 



50. Diagram TO Illustrate Fertilization 315 



51. Variation IN 5t'J«w 5/><:'dc6i7e Due TO Differences in Color OF 



Light 329 



52. Temperature Phases of the Diurnal Peacock-Butterfly . 330 



53. Morphological Cycle of Head Height in £?>'a/o(fa/>/mia . .331 



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