Habitat.—Central Pacific, Station 268, depth 2900 fathoms.
3. Eutympanium coronarium, n. sp.
Eight thorny columellæ, obliquely descending and curved like a bow, divergent in the upper part, convergent in the lower. Basal ring circular, mitral ring octagonal. Both horizontal rings armed with eight stout thorny spines, which on the mitral ring are smaller and directed obliquely upwards, on the basal ring larger and directed downwards, each with a recurved hook.
Dimensions.—Height of the shell 0.08, breadth 0.06.
Habitat.—South Atlantic, Station 332, depth 2200 fathoms.
4. Eutympanium militare, n. sp. (Pl. [82], fig. 11).
Ten parallel and vertical columellæ straight and smooth, cylindrical. Both horizontal rings equal, circular, armed with numerous short conical spines, divergent in all directions. Ten to twenty spines on each ring larger than the others.
Dimensions.—Height of the shell 0.1, breadth, 0.08.
Habitat.—Western Tropical Pacific, Station 225, depth 4475 fathoms.
5. Eutympanium dodecarium, n. sp.