Dimensions.—Height of the frontal ring 0.1, breadth 0.15.
Habitat.—Western Tropical Pacific, Station 225, depth 4475 fathoms.
3. Eucoronis nephrospyris, n. sp. (Pl. [82], fig. 5).
Frontal ring kidney-shaped, in the upper half convex, in the lower concave, with a sagittal constriction (often much deeper than in the specimen figured). Sagittal ring ovate, about two-thirds as high as the frontal ring. Rods of both rings without edges, cylindrical, armed with numerous short conical thorns.
Dimensions.—Height of the frontal ring 0.1 to 0.12, breadth 0.15 to 0.18.
Habitat.—Cosmopolitan; Mediterranean, Atlantic, Indian, Pacific, many Stations, surface and at various depths.
4. Eucoronis angulata, n. sp. (Pl. [82], fig. 3).
Frontal ring violin-shaped, twice as broad as high, on the upper and the lower margin concave, with a deep sagittal constriction. Sagittal ring pentagonal, with straight horizontal basal rod, two-thirds as high as the frontal ring. Rods of both rings with sharp prominent edges, bearing numerous short pyramidal spines.
Dimensions.—Height of the frontal ring 0.09, breadth 0.17.
Habitat.—Central Pacific, Station 272, depth 2600 fathoms.