Definition.—Feet branched or forked.
5. Tripodiscium furcatum, n. sp.
Shell ovate, rough, nearly as broad as long. Pores subregular, circular, twice as broad as the bars. Mouth constricted, two-thirds as broad as the shell, with three divergent parallel and vertical feet, which are as long as the shell, and forked at the distal end.
Dimensions.—Shell 0.09 long, 0.08 broad; feet 0.07 long.
Habitat.—Tropical Atlantic, Station 338, depth 1990 fathoms.
6. Tripodiscium ramosum, n. sp.
Shell ovate, tuberculate, nearly as broad as long. Pores irregular, roundish, of very different sizes. Mouth constricted, half as broad as the shell, with three large, divergent, irregularly branched feet, nearly twice as long as the shell. (Similar to Tristylospyris ramosa, Pl. [52], fig. 23, but without sagittal ring and constriction.)
Dimensions.—Shell 0.07 long, 0.06 broad; feet 0.15 long.
Habitat.—Central Pacific, Station 274, depth 2750 fathoms.
7. Tripodiscium sphærocephalum, n. sp. (Pl. [52], fig. 21).