Habitat.—North Pacific, Station 244, surface.

5. Diplocolpus sulcatus, n. sp. (Pl. [140], fig. 8).

Mantle of the double cone thin walled, compressed, with elliptical transverse section; its contour straight; surface with twelve to sixteen deep longitudinal furrows, which are separated by thin, undulating, double edged ribs; margin little dentated. Hydrotomical spines short, pyramidal, with six dentate wings. Transverse diameter of the shell a little larger at the polar mouth than at the equator, about one-third of the whole length of the shell.

Dimensions.—Length of the shell 0.17; breadth on the equator 0.05, on the poles 0.06.

Habitat.—South Pacific, Station 291, surface.

Notes.

[1]

The numbers preceded by L. N. refer to the list of names of authors in the Bibliography on p. [clxxvi].

[2]

Sitzungsb. med.-nat. Gesellsch. Jena, February 16, 1883.