xii THE LIFE OF CRUSTACEA 



FIG. PAGE 



57. A Water-flea {Daphnia pulex), Female, with Ephip- 



piUM containing Two "Resting Eggs." x 20 - 167 



58. Bythotrephes longmanus, Female, with Embryos in the 



Brood-sac. x 12 - - - - - 169 



59. Diaptomiis casruleus, Female, x 25 - - - 171 



60. Asellus aqtiaticus, Female, x 4 - - - - i73 



61. Map showing the Distribution of Crayfishes - 175 



62. A Well Shrimp (Niphaygus aqiulex). x 7 - - 185 



63. The Sea-slater {Ligia oceanica). About Twice Natural 



Size ....... 200 



64. Structure of the Breathing Organs of Poycellio 



scaher ..-.-.. 202 



65. Armadillidium vidgare. x 2| - - - - 203 



66. Two Branches of a Coral [Seriatopora) showing 



"Galls" inhabited by the Crab Hapalocarcinus 

 marsiipialis. On the Right the Female Crab, 



EXTRACTED FROM THE GaLL AND FURTHER ENLARGED 211 



67. Hyperia galba, Female. Enlarged - - - 213 



68. A, The Crab Melia tessellata clinging to a Branch of 



Coral, and carrying in Each Claw a I.iving Sea- 

 anemone ; B, One of the Claws further enlarged 

 TO show the Way in which the Anemone is held 216 



69. The Common Pea Crab {Pinnotheres piston), Female. 



Natural Size ...--. 217 



70. Cirolana borealis. About Twice Natural Size - - 219 



71. A, Front Part of Body of a Prawn [Spirontocavis 



polaris), from Above, showing on the Right Side 

 A Swelling of the Carapace caused by the 

 Presence of the Parasite Bopyroides hippolytes in 

 the Gill Chamber ; B, the Female Parasite 



EXTRACTED AND FURTHER ENLARGED ; C, THE MaLE 



Parasite on Same Scale as the Female - - 2'22 



72. A Fish-louse {Caligtis rapax), Female, x 5 - - 225 



73. Stages of Development of Lerncea branchialis. F is 



SLIGHTLY, THE OtHER FIGURES GREATLY, ENLARGED - 226 



74. Stages of the Life-history of Hamocera dana, One 



OF THE MONSTRILLID^ - - . - . 229 



75. Free - swimming Stages of Sacculina carcini. Much 



ENLARGED ------- 232 



