Habitat.—Mediterranean (Nice), Haeckel.
Subgenus 2. Actinelidium, Haeckel.
Definition.—Radial spines compressed, two-edged; their transverse section elliptical or lanceolate.
3. Actinelius protogenes, n. sp.
Spines fifty to sixty, compressed, two-edged, gradually broadened towards the truncated distal end. Basal or proximal end thin, pyramidal. The spines of this species are similar to those of Actinastrum pentazonium (p. [733]) and of Chiastolus amphicopium (Pl. [129], fig. 3), but much more numerous, smaller, and not regularly disposed. These latter two Actinelida must be separated on account of the regular disposition of the thirty-two spines.
Dimensions.—Length of the spines 0.2, basal breadth 0.008, distal breadth 0.02.
Habitat.—South Pacific, Station 165, surface.
Subgenus 3. Actinelonium, Haeckel.
Definition.—Radial spines quadrangular, prismatic, or pyramidal, their transverse section square.
4. Actinelius pallidus, Haeckel.