ACTINOPOPOrs IIOLOTHUUIOIDKA. 



23l 



of the species capcnsi:^. 



An interesting (rcological fact in relation to this holothnrian 

 in life came under my observation. An aniphipod crustacean is 

 often found lying on its back on the skin of the holothnrian ; 

 the skin gradnally heaves up around the crustacean, eventually 

 to enclose it in a tightly fitting cavity, but not completely, for 

 its ventral surface remains exposed and its four tentacles stick out 

 freely, moving constantly. When the holothnrian is kept in a jar, 

 the crustaceans thus imprisoned all become liberated after a while, 

 and the cavities in the skin which held tliem totally disappear, 

 leavin" no trace of having ever accommodated such eonnnensals. 



67. Cii<inntiri(( rhrouhjcJini Theel. 



(PI. Vm., figts. 71—72; toxtfig. 4G). 

 Curmnarla rhrnuhjdun Theel 188Gr/, p. lO-l— I.rmvm 1889— '92, !> 

 344._Clai;k lOOl-s p. S:34, D. IV., figs. 11-2().-Clai!K lUOlJ. p. 492. 



Specimens examined : — 



