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 borcalis), 



FEMALE ... - - 246 



80. THE GRIBBLE (Limnoria lignorum). 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- 



mania), A LIVING REPRESENTATIVE OF THE SYNCARIDA. 

 SLIGHTLY ENLARGED - - 264 



85. Praanaspides precursor, 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 RlGHT OR LEFT SlDE OF THE BODY. 

 (From Brit. Mus. Guide) - 26 



II. Apus cancriformis FROM KIRKCUDBRIGHTSHIRE. SLIGHTLY 



ENLARGED - - - 63 



