Basal ring elliptical, with two descending, slightly curved conical feet, lateral prolongations of the subcircular frontal ring. The ovate sagittal ring bears at the apex a cylindrical vertical horn, which is connected by two descending lateral arches (or galear arches) with the uppermost part of the frontal ring.
Dimensions.—Height of the frontal ring 0.1, breadth 0.13.
Habitat.—Central Pacific, Stations 265 to 268, depth 2900 fathoms.
Subgenus 2. Tripocoronis, Haeckel, 1881, Prodromus, p. 445.
Definition.—Basal ring with three descending feet (one caudal and two pectoral).
3. Podocoronis cortiniscus, n. sp. (Pl. [97], fig. 2).
Basal ring violin-shaped, with three straight divergent thorny feet, about as long as the ovate sagittal ring. The dorsal part of the latter is straight, vertical, and prolonged downwards into the caudal foot, upwards into a stout, thorny, vertical apical horn. The ventral part is semicircular and gives off the lateral branches, forming the kidney-shaped sagittal ring. All the rings and their apophyses are armed with stout thorns. This and the following tripodal species may be directly derived from Cortina.
Dimensions.—Height of the frontal ring 0.1, breadth 0.15.
Habitat.—Central Pacific, Station 274, depth 2750 fathoms.
4. Podocoronis tripodiscus, n. sp.