CONCEALMENT AND COLORS IN CRUSTACEA—MINKIEWICZ. 485 
In instinct not maimed, the first phase is that of the chromo- 
reactions of the animal in regard to the color of the environment and 
the colored surfaces of the objects of concealment. The material for 
disguising is determined by the variable synchromatic chromotropism, 
which drives the animal inevitably toward certain colored surfaces, 
according to the sum of the given conditions. Once the animal 
touches the material, whatever it may be, if nothing prevents it, there 
begins immediately the long series of very complicated reflex move- 
ments provoked by the tangoperceptions* of the claws, directed by 
the tango- and chemoperceptions of the buccal pieces, and helped on 
toward the end by the tangoperceptions of the dorsal hooks. 
“Tactile perceptions, 
