Sagittal ring subcircular, thorny with a small thorny apical horn. Basal ring also nearly circular, with two large semicircular gates and a few small thorns. All four feet curved and forked, the fork-branches again ramified, with numerous short curved and pointed branches. The two lateral feet (right and left) are larger and more branched than the two sagittal feet (sternal and caudal foot).
Dimensions.—Height of the sagittal ring 0.12, breadth 0.1.
Habitat.—Central Pacific, Station 266, depth 2750 fathoms.
3. Stephaniscus quadrigatus, n. sp. (Pl. [92], fig. 15).
Sagittal ring oblique, ovate, with three prominent thorny edges; its dorsal rod nearly straight and vertical, the ventral rod strongly curved; apex with a small curved horn. Basal ring with a few short thorns and four gates of different size; the two anterior (jugular pores) ovate or nearly triangular, two-thirds as broad as the two posterior subcircular or pentagonal (cardinal pores). All four feet simple, curved, with three edges, the posterior (caudal) foot larger, the anterior (sternal) foot smaller than the two lateral (pectoral) feet.
Dimensions.—Height of the sagittal ring 0.09, breadth 0.07.
Habitat.—Tropical Atlantic, Station 351, surface.
4. Stephaniscus medusinus, n. sp.
Sagittal ring elliptical, thorny, with a larger apical horn. Basal ring nearly square, with short marginal thorns and four large ovate gates of nearly equal size. All four feet of equal size divergent, curved, irregularly branched, with short curved branches.
Dimensions.—Height of the sagittal ring 0.13, breadth 0.09.