New species of the deep-sea holothurian family Elpidiidae Théel, 1879

Descriptions are given of three new species of the deep-sea holothurian family Elpidiidae: Achlyonice margitae n.sp., Achlyonice myriamae n.sp. and Peniagone thieli n.sp. myriamae is recorded from the Bay of Biscay, and the other two species from New Caledonia. The species belonging to the genus Achlyonice are briefly discussed.