296 COLOUR IN NATURE ci 



PIGMENTS INTRODUCED INTO BODY CAVITY 



Conclusions 



Although certain analogies between the fate of 

 introduced pigments and the natural occurrence of 

 pigment in the tissues are thus rare, yet suggestions 

 as to analogy have been very freely made. Eisig 

 considers that the pigment which occurs somewhat 

 sparingly in the skin of the Capitellidae is an effete 

 product temporarily stored there, and further regards 

 this as a widespread origin of pigment. Mr. Durham, 

 basing his view largely on his own researches on 

 Echinoderms, regards colouring - matters as either 

 waste products or effete respiratory pigments which, 

 when eliminated by means of amoeboid cells, may 

 give rise to coloration of the skin. 



