Subgenus 2. Lithocoronis, Haeckel, 1881, Prodromus, p. 445.
Definition.—Rings armed with numerous large, branched or arborescent spines.
5. Eucoronis cervicornis, n. sp.
Frontal ring kidney-shaped, in the upper half convex, in the lower concave, with sagittal constriction. Sagittal ring ovate, two-thirds as high as the frontal ring. Both rings armed with numerous stout spines, irregularly branched like a deer's antler. (Very similar to Coronidium cervicorne, Pl. [82], fig. 1, which I formerly confounded with it, but differing in the complete sagittal ring, which in the latter form is incomplete and has lost its basal part.)
Dimensions.—Height of the frontal ring 0.12, breadth 0.2.
Habitat.—Central Pacific, Station 264, surface.
6. Eucoronis arborescens, n. sp.
Frontal ring kidney-shaped, with a deep sagittal constriction in the concave basal part. Sagittal ring ovate, half as high as the frontal ring. Both rings armed with numerous thin, richly branched and arborescent spines (branches much thinner and more numerous than in the preceding and following species).
Dimensions.—Height of the frontal ring 0.15, breadth 0.25.
Habitat.—Equatorial Atlantic, Station 247, surface.