xx LIST OF ILLUSTRATIONS 



PIG. PAGE 



31. Deep-sea Cuttlefish, Cirrothauma. After Chun . Plate 92 



32. Two Deep-sea Fishes . . . , . .95 



33. Three species of water-flea, Cyclops. After Neubaur 



Plate 104 



34. A piece of gauze used in tow-netting. After Lohmann 108 



35. Organisms of the Dwarf -Plankton. After Lohmann 110 



36. Nets made by larval caddis-flies. After Wesenberg- 



Lund . . , . . . . . Plate 138 



37. Section through a land-crab. After Semper . . 157 



38. Mudfish, Protopterus, in its summer-sleep. After W. N. 



Parker . . .' 160 



39. Young spiders moving around the nest. After Roesel . 211 



40. Worker Termite. After Bugnion . . . *;, . 216 



41. Worker Termite. After Bugnion and Popoff . . 218 



42. Soldier Termite. After Bugnion and Popoff. . . 220 



43. Insect in cataleptic state. After Schmidt. . . 231 



44. Bird-catching spider catchmg a humming-bird Plate 242 



45. Ctenophore or Sea -Gooseberry. After Mayer . . 268 



46. Acacia twig tenanted by ants. After Schimper . . 286 



47. Association of Hydractinia, whelk, and hermit-crab . 288 



48. Fierasfers entering and leaving Holothurians. After 



Emery Plate 290 



49. Colonial Radiolarian with partner Algse. After Brandt 295 



50. Green Hydra expanded and contracted . . 296 



51. Stages in life-history of Liver-Fluke. After Thomas 308 



52. Section of a pearl. ^4/ter Rubbell. . . . Plate 312 



53. Shell of Freshwater Mussel with pearls. After Rubbell 



Plate 314 



54. Leaf-cutting ants at work. After Moeller f . 326 



55. Section of nest of Humble-Bee. After Wagner. . 343 



56. Nest of wasp. After Janet . . ... 345 



57. Mosquito, Anopheles. After Nuttall . . . 363 



58. Egg of Ascidian. After Duesberg . . . .375 

 58A. Segmentation of the Egg of a Frog. AfterEles . . 376 



59. Chain of Embryos from one Ovum. After Marchal 379 



60. A dividing Cell, showing chromosomes. After Haecker 380 



61. Diagram of a Cell . . . ... . 387 



62. Male spiders fighting. After Peckham . . . 412 



63. Male spider dancing. After Peckham , : . . . 413 



64. Female spider with cocoon, After Blackwall . .421. 



