Memoirs from the Biological Laboratory OF THE JOHNS HOPKINS UNIVERSITY IV, 4 WILLIAM K. BROOKS, EDITOR PHYSIOLOGY AND HISTOLOGY OF THE CUBOMEDUSÆ INCLUDING DR. F. S. CONANT’S NOTES ON THE PHYSIOLOGY A DISSERTATION PRESENTED TO THE BOARD OF UNIVERSITY STUDIES OF THE JOHNS HOPKINS UNIVERSITY FOR THE DEGREE OF DOCTOR OF PHILOSOPHY BY E. W. BERGER BALTIMORE THE JOHNS HOPKINS PRESS 1900 [Illustration] PRINTED BY The Lord Baltimore Press THE FRIEDENWALD COMPANY BALTIMORE, MD., U.S.A. This Memoir is a continuation of the work upon the Cubomedusæ which was begun by the late Dr. FRANKLIN STORY CONANT, and it contains his notes of physiological experiments, as well as new results which have been obtained by Dr. E. W. BERGER from the study of material which had been collected by Dr. CONANT, who had hoped to make it the object of further study. In order that this work may be made public as a continuation of Dr. CONANT’S researches, his sister, GRACE WILBUR CONANT, has, with the coöperation of other members of his family, made an adequate and generous provision for its publication. For this gift, which is at once a contribution to science and a memorial of an able and promising investigator, lately student and fellow in this institution, the Johns Hopkins University returns its grateful acknowledgments. DANIEL C. GILMAN, _President_. W. K. BROOKS, _Professor of Zoölogy_. CONTENTS. PAGE INTRODUCTION. History 1 Epitome of Anatomy 2 PHYSIOLOGICAL. CHARYBDEA. Light and Darkness 5 Concretions 8 Sensory Clubs 9 Velarium and Frenula 11 Pedalia, Interradial Ganglia, Tentacles 12 Stomach, Suspensoria, Proboscis, Subumbrella 13 Margin, Radial Ganglia, Nerve 15 Stimulation 17