LIST OF ILLUSTRATIONS 

 IN THE TEXT 



FIG. PAGE 



1. THE COMMON LOBSTER (Homarus gammarus), FEMALE, 



FROM THE SIDE - 7 



2. ONE OF THE ABDOMINAL SOMITES OF THE LOBSTER, WITH 



ITS APPENDAGES, SEPARATED AND VIEWED FROM IN 



FRONT - - 9 



3. THIRD MAXILLIPED OF LOBSTER - - n 



4. V^ALKING LEGS OF LOBSTER - 12 

 APPENDAGES OF LOBSTER IN FRONT OF THIRD MAXIL- 

 LIPED 13 



6. DISSECTION OF MALE LOBSTER, FROM THE SIDE - 16 



7. GILLS OF THE LOBSTER, EXPOSED BY CUTTING AWAY THE 



SIDE-FLAP OF THE CARAPACE (BRANCHIOSTEGITE) - 18 



8. FIRST LARVAL STAGE OF THE COMMON LOBSTER, x 4 - 28 



9. SIDE - VIEW OF ROSTRUM OF (A) COMMON LOBSTER 



(Homarus gammarus) AND (B) AMERICAN LOBSTER 

 (Homarus americanus) - - 32 



10. THE " FAIRY SHRIMP " (Chirocephalus diaphanus), MALE. 



x 2 - 35 



11. Estheria obliqua, ONE OF THE CONCHOSTRACA - - 36 



12. Daphnia pulex, A COMMON SPECIES OF "WATER-FLEA." 



MUCH ENLARGED - - 37 



13. SHELLS OF OSTRACODA. MUCH ENLARGED - 38 



14. Cyclops albidus, \ SPECIES OF COPEPOD FOUND IN FRESH 



WATER - - 39 



15. Nebalia bipes. ENLARGED - - 44 



16. Mysis relicta, ONE OF THE MYSIDACEA. ENLARGED 47 



17. Gnathophausia willemoesii, ONE OF THE DEEP-SEA MYSI- 



DACEA. HALF NATURAL SIZE - - 48 



8. Diastylis goodsiri, ONE OF THE CUMACEA. ENLARGED - 49 



ix 



