CONTENTS. 



NOTE. 



TERMINOLOGY. 



THE TEST. GROWTH OF NEW PLATES. 



PERISCHOECHINIDAE. 



SPINES. FASCIOLES. PEDICELLARIAE. SPHAERIDIA. 



ALIMENTARY CANAL. GENITAL ORGANS. 



OCULAR SYSTEM. ANAL SYSTEM. ACTINOSTOME. 



JAWS. 



CIRCULATION. WATER SYSTEM. MADREPORIC BODY. 



NERVOUS SYSTEM. 



HABITS OF ECHINI. 



EMBRYOLOGY. ON THE YOUNG STAGES OF ECHINI. 



GEOLOGICAL SUCCESSION OF THE ECHINI. 



HOMOLOGIES AND AFFINITIES OF THE ECHINI. 



