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 



