ACTINOPODOÜS HOLOTHrEIOIDEA. 



235 



of the species capcnsis. 



An interesting œcological fact in relation to this holothurian 

 in life came nnder my observation. An amphiiDod crustacean is 

 often found lying on its back on tlie skin of the holothurian ; 

 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 holothurian is kept in a jar, 

 the crustaceans thus imprisoned all become liberated after a while, 

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

 leaving no trace of having ever accommodated such commensals. 



57. Cuciimaria clivonhJeJmi Thïel. 



(PI. Yin., figs. 71—72 ; tcxtfig. 40). 



Cuommrla chronhjehni Théel 1886^', p. lO-j.— Ludwig 1889— '92, p. 

 344.-CLAEK 1901c, p. 334, PI. IV., figs. 11-20.— Claiîk 190h7. p. 492. 



Specimens examined : — ■ 



