LITHOIUUS 



91 



of trees (Fig. 94 «), in deep woods or in caves. If one of these 

 light-shunners is placed on a tat)lc near a window, tiirough 

 whicli the sunlight is falling, it will turn tail to the sun and 

 move away from the window. If one goes out at night with 

 a lantern, however, one wdll find many animals running ai)out 

 on the surface of the ground seeldng for food or for their mates. 

 Many light-shunners, such as those that hve in caves, remain 



Fig. 94 a.- 

 of wood. 



?*'7/ 



-A colony of light-shunners on the underside of an upturned piece 

 From left to right, Armidillidium, Oniscus, Helix, and Lithol^ius. 



there during their entire hfe, never experiencing rays of natural 

 light. They get into the caves in the first place fiecause they are 

 light-shunners and because their organization fits them to live in 

 the dark. Like most light-shunners, cave animals love not only 

 darkness but contact and moisture as well ; all of these con- 

 cUtions they find in caves, particularly in damp crevices and 

 corners. Very many close relatives of cave animals are to be 

 found outside of caves in greenhouses, secreted under boards 

 during the daytime, just because they find in greenhouses the 

 conditions of equable temperature, moisture, and contact 

 which their nature demands. 



