LIST OF ILLUSTRATIONS xiii 



FIG. PAGE 



76. Early Stage of Sacculina within the Body of a 



Crab .....-- 234 



77. Rostrum and Fore Part of Carapace, seen from 



Above, of (A) Red - clawed Crayfish {Astacus 

 fluviatilis) and (B) White-clawed or English Cray- 

 fish [Astacus pallipes) . . . . . 242 



78. The Common Shrimp (Crangon vulgaris). Natural Size 244 



79. The Norwegian Deep-water Prawn {Pandalus borealis), 



Female -..-.-- 246 



80. The Gribble {Limnoria lignoriini). Much enlarged - 254 



81. Restoration of a Trilobite (Triarthrus becki), showing 



THE Appendages. Upper Side on Right, Under 

 Side on Left. Slightly enlarged - - - 258 



82. Ceratiocaris papilio, One of the Fossil Phyllocarida - 262 



83. Pygocephalus cooperi, from the Coal-measures : Under 



Side of a Female Specimen, showing the Over- 

 lapping Plates of the Brood-pouch - - 263 



84. The Tasmanian "Mountain Shrimp" {Anaspides tas- 



manics), a Living Representative of the Syncarida. 

 Slightly enlarged . . . - . 264 



85. Pr^anaspides pyacursor, One of the Fossil Syncarida, 



from the Coal-measures of Derbyshire, Slightly 

 enlarged ------- 265 



FULL-PAGE PLATES 



PLATE FACING PAGE 



I. Male and Female Lobsters, showing the Differ- 

 ence IN the Relative Breadth of the Abdomen 

 IN THE Two Sexes. This Figure also illustrates 

 the Dissimilarity of the Large Claws, and the 

 Fact that the "Crushing Claw" may be on 

 either the Right or Left Side of the Body. 

 (From Brit. Mus. Guide) - - - - -26 



IL Apus cancriformis from Kirkcudbrightshire. Slightly 



ENLARGED --.---- 63 



