2. Dendrocircus dodecarrhiza, n. sp.
Gate obliquely ovate. Ring irregularly quadrangular, with three prominent edges. From the latter arise at the four corners twelve divergent, irregularly branched spines (three in each corner), about as long as the radius of the gate, with curved branches; the three basal spines larger than the nine others.
Dimensions.—Diameter of the gate 0.08 to 0.1; length of the spines 0.04 to 0.06.
Habitat.—Indian Ocean (Maldive Islands), surface (Haeckel).
3. Dendrocircus dodecancistra, n. sp. (Pl. [81], fig. 11).
Gate obliquely ovate or nearly elliptical. Ring irregularly ovate, with three distorted edges and six pairs of branched spines. The two ventral pairs are much more distant than the two dorsal pairs, the ventral rod being longer and more curved than the dorsal rod. All twelve spines are of nearly equal size, are more or less curved, about as long as the diameter of the gate, and each bears six to twelve irregular short branches at the end.
Dimensions.—Diameter of the gate 0.07 to 0.08; length of the spines 0.05 to 0.08.
Habitat.—Tropical Atlantic, Station 342, depth 1445 fathoms.
4. Dendrocircus arborescens, n. sp. (Pl. [81], fig. 10).
Gate irregularly roundish or nearly circular. Ring of the same form, with slight edges and six pairs of elegant arborescent spines (one apical, two dorsal, two ventral, and one basal pair); the three latter somewhat larger than the three former. Each tree is larger than the ring, in the basal half simple, in the distal half forked, each fork-branch with numerous dichotomous terminal branches.