CONTRIBUTIONS FROM THE ZOOLOGICAL LABORATORY OF THE MUSEUM OF 

 COMPARATIVE ZOOLOGY AT HARVARD COLLEGE, UNDER THE DIRECTION OF 

 E.L. MARK, No. 207 



A COMPARISON OF THE REACTIONS OF A SPECIES 

 OF SURFACE ISOPOD WITH THOSE OF A SUB- 

 TERRANEAN SPECIES 



PART I. EXPERIMENTS WITH LIGHT 

 A. M. BANTA 



With Six Figures 



Introduction 24 3 



Material 246 



I Horizontal illumination 248 



1 Methods and apparatus 248 



2 Asellus 252 



A Following previous exposure to light 252 



B After being in darkness 263 



3 Caecidotea 269 



II Vertical illumination 280 



1 Methods and apparatus 280 



2 Asellus 284 



3 Caecidotea 292 



III Illumination by direct sunlight with the rays at right angles to the long axis of the tank 301 



1 Asellus 302 



2 Cfficidotea 305 



IV Summary of reactions to light 307 



V Bibliography 309 



INTRODUCTION 



An investigation (Banta '07) of the natural history of the species 

 of animals living within Mayfield's Cave near Bloomington, Ind., 

 suggested the desirability of studying the reactions to various 

 stimuli (light, etc.) of some cave species in comparison w^ith the 

 reactions to the same stimuli of near relatives living in other 

 situations. 



THE JOURNAL OP EXPERIMENTAL ZOOLOGY, VOL. 8, NO. S. 



