LIGHT PRODUCTION IN CEPHALOPODS, I. AN INTRODUCTORY SURVEY. S. STILLMAN BERRY, REDLANDS, CALIFORNIA. CONTENTS. PAGE 1. Introduction 141 2. Classification of Cephalopods 144 Tetrabranchiata 144 Dibranchiata 144 Octopoda 145 Decapoda 145 Synoptic Tables 146 3. Distribution of the Photogenic Function Among Cephalopods 147 Preliminary Remarks 147 Synopsis of the Genera and Species 149 Summary of Recent Cephalopoda 157 Summary of Preceding Tables 158 Recapitulation of Data 158 4. Actual Observance of the Phenomenon 159 i. INTRODUCTION. Recent interest in the subject of biophotogenesis has been so great, and bids so fair to continue at high ebb, until at least the problem of the economical artificial production of chemical light has been solved, that for the use of the many classes of investi-gators, most of whom are not zoologists and can scarcely be expected to possess accurate taxonomic knowledge of the group with which they may chance to wish to work, it would be exceed-ingly desirable if there could be placed on record in compact form a summary of all the species of each principal division of plants and animals which are known or thought to possess photogenic properties. The writer's desire to see this service performed on behalf of the Cephalopods, animals which must always stand well up with the highest in the estimation of the student of or-ganic light, furnished the initial stimulus which has finally broadened into the production of the present paper. As a taxonomist, however, and, in so far as this particular group of 141
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