2. Spongotripus neumayri, Haeckel.
Spongechinus neumayri, Dunikowski, 1882, Denskchr. d. k. Akad. d. Wiss. Wien, xlv. p. 28, Taf. v. fig. 59.
Spongy disk circular, nearly spherical; three radial spines on its margin of equal size and equidistant, pyramidal, nearly as long as the diameter of the disk, and three times as long as broad at the base.
Dimensions.—Diameter of the disk 0.15 to 0.2; length of the spines 0.11, basal breadth 0.04.
Habitat.—Fossil in the Jura of the Alps and in Tertiary rocks of Barbados.
3. Spongotripus strepsiceros, n. sp.
Spongy disk circular; three radial spines on its margin of equal size and equidistant, angular, twice as long as the diameter of the disk, spirally twisted like the horns of Antilope strepsiceros.
Dimensions.—Diameter of the disk 0.15; length of the spines 0.3, basal breadth 0.02.
Habitat.—Pacific, central area, Station 272, depth 2600 fathoms.