LIST OF ILLUSTRATIONS 



HEAD OF INDIAN MUNGOOSE (HERPESTES SMITHII\ 



SHOWING HORIZONTAL PUPIL . . . Frontispiece 



PAGE 

 LEAF-FISH 66 



DIAGRAM OF PHYLETIC DIVERGENCE AND PARALLELISM . 70 

 PARALLEL DIVISIONS OF ECHINODERMATA . . . .71 



PARALLEL DIVISIONS OF VERTEBRATA 72 



PARALLELISM WITH CONVERGENCE AMONGST MAMMALS . 80 

 HEAD OF DRYOPHIS PULVERULENTUS IN SIDE VIEW . 93 



EYE OF DUSSUMIERIA, SHOWING PERFORATED ADIPOSE 



EYELID 95 



INTESTINAL TRACT OF DUSSUMIERIA . . . . log 



DISSECTION OF THE ALIMENTARY TRACT OF CHATOESSUS 



NASUS FROM THE LEFT SIDE IIO 



PARALLELISM WITH CONVERGENCE BETWEEN TWO FAMILIES 



OF FISHES, MUGILIDjE AND CLUPEID^ . . .112 



HEAD AND FORE-BODY OF ICHTHYOPHIS GLVTINOSUS, TO 



SHOW THE COLLAR-LIKE RESPIRATORY REGION . 143 



