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The Norwegian North-Atlantic Expedition 1876-1878. Holothuroidea. Plate XIII.Fig. 1 - Myriotrochus Rinkii, Steenstr. Fig. 2 - Ocnus (Cucumaria) minutus,Fabricius. Fig. 3 - Trochostoma arcticum, Marenz. Fig. 4 - TrochostomaThomsonii, Dan. & Koren. Fig. 5 - Trochostoma Thomsonii, var. maculatum, Dan &Koren. Fig. 5 - Part of posterior end of Tr. Thomsonii, var., magnified.