Dimensions.—Diameter of the gate 0.06 to 0.08; length of the spines 0.12 to 0.15.
Habitat.—Central Pacific, Stations 266 to 274, surface.
5. Dendrocircus elegans, n. sp. (Pl. [81], fig. 13).
Gate irregularly ovate. Ring thick, ovate, with three denticulate edges and six bunches of stout, branched and spinulate, curved spines. The four ventral spines are more distant than the four dorsal, the ventral rod being more curved than the dorsal. The latter bears above the two apical spines. The two basal spines are much larger, deeply forked; their four fork-branches may be compared to the four basal feet of Stephanium.
Dimensions.—Diameter of the ring 0.09 to 0.11; length of the spines 0.03 to 0.06.
Habitat.—Central Pacific, Station 274, depth 2750 fathoms.
6. Dendrocircus barbadensis, n. sp.
Gate irregularly ovate or nearly semicircular. Ring of the same oblique form, thick, with interrupted and distorted edges, armed with eight to twelve larger irregularly formed and branched acute spines; between them numerous conical smaller spines. This common species is very polymorphous and variable.
Dimensions.—Diameter of the ring 0.05 to 0.08; length of the spines 0.005 to 0.02.
Habitat.—Fossil in Barbados.