No. 638] 



■LD) 235 



All increased transiiaroucy when kcjit in .-iii ;i(iuaiiuin, 

 e.ri,,a glass-jar, may he desi<;-iiatt'(l adaptive coloration. 

 The odorous substance that the aniiiial fxiidcs when 

 touched by an enemy is its main protection. However, 

 Step, 1901, records some very interest in^' f.iets ifl.itivo 

 to protective coloration nnion.ir Xn(lil)i';i ndi^ : 



Kvid(Mitly .]/-//7,r Irnuina needs no i)rotective coloration, 



why it does not possess nematocysts is perhaps because 

 it does not live on Ifydroids, but mostly on Crustacea. 



(ilaser, 11)03, in his discussion of the origin of nemato- 

 cysts in Xudil)i-anchs gives a historical i-eview. inchiding 



