CONTENTS. 



Chap. tagk 



I. Introdixtory 1 



II. The Species of Meltta 7 



III. Morphology OF Crustacea 13 



lY. Sexual Peculiarities AND Dimorphism 19 



V. Eespiratiox in Land Crabs 30 



VI. Structure of the Heart is Edriophthalma 39 



VII. Developmental History of Podophthalma 47 



VIII. Developmental Hi:sTORY OF Edriophthalma 69 



IX. Developmental History of Entomostraca, Ciruipedes, 



AND Ehizocephala 83 



X. On the Principles of Classification 97 



XL On THE Progre.'>s OF Evolution 110 



XII. PRoGRE.'is of Evolution IN Cru.'jtacea 122 



29120 



