CONTENTS. 



CHAP. PAGE 



I. INTRODUCTORY 1 



II. THE SPECIES OF MELITA 7 



III. MORPHOLOGY OP CRUSTACEA 13 



IV. SEXUAL PECULIARITIES AND DIMORPHISM 19 



V. KESPIRATION IN LAND CRABS SO 



VI. STRUCTURE OF THE HEART IN EDRIOPHTHALMA 39 



VII. DEVELOPMENTAL HISTORY OF PODOPHTHALMA 47 



VIII. DEVELOPMENTAL HISTORY OF EDRIOPHTHALMA 69 



IX. DEVELOPMENTAL HISTORY OF ENTOMOSTRACA, CIRRIPEDES, 



AND RHIZOCEPHALA 83 



X. ON THE PRINCIPLES OF CLASSIFICATION 97 



XI. ON THE PROGRESS OF EVOLUTION 110 



XII. PROGRESS OF EVOLUTION IN CRUSTACEA . . . 122 



