TABLE OF CONTENTS. 



INVEKTEBRATA. 



PAGE 



ANATOMICAL HISTORY 



PLATE I. 



The dorsal aspect of the CRAB (Cancer pagurus) 



PLATE II. 



The ventral aspect of the CRAB (Cancer pagurus) . 



PLATE III. 



The dorsal aspect of the LOBSTER (Astacns marinus) . 



PLATE IV. 



The ventral aspect of the LOBSTER (Astacus marinus) . 



PLATE V. 



The CENTIPEDE (Scolopcndra morsitans), Fig. 1 



The dorsal aspect of the EARTHWORM (Lumbricus terrestris), Fig. 2 



The ventral aspect of the same, Fig. 3 



The LEECH (Hirudo medicinalis), Fig. 4 



