. Fig. 3. Ophioscolex nutrix, a, Part of oral side, b. Part of dorsal side, x8. c. Side view of distal arm joints, showing the two upper spines transformed into hooks, '30. d. Spicules from stomach wall, X45. Mouth papillae rather irregular and varying in number; generally the distalmost one or two are somewhat enlarged. Buccal shields conspicuously broader than long, with an obtuse angle within and a straight outer edge. Adoral shields joining within. Ventral plates contiguous in the proximal part of arm, separated beyond the disk; the distal

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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti