    Sentence 4: When.-.do bathyctena : chuni,  euplokamis * stationis' . and’. eurhamphaea  vexilligera excrete secretions?:    Sentence’ 2: When: some- species; including.  Bathycténa chuni,, Euplokdmis. ‘stationis “and  Eurhamphaea \vexilligera, are disturbed, théy|  produce secretions (ink) that luminésce at much’  thesame wavelengths as theit-bodies.    