half a hyaline, circular ring, in the lower half divided into from eighteen to twenty-four triangular, curved, little convergent feet.
Dimensions.—Cephalis 0.02 long, 0.05 broad; thorax 0.1 long, 0.09 broad.
Habitat.—Cosmopolitan; Atlantic, Indian, Pacific; many stations, at various depths.
17. Carpocanium coronatum, Ehrenberg.
Shell ovate, smooth, with perfectly hidden, subspherical cephalis. Length of the two joints = 2 : 9, breadth = 2 : 8. Pores small and very numerous, twice as broad as the bars, regular, circular, in about twenty longitudinal rows. Mouth little constricted, two-thirds as broad as the thorax. Peristome with twenty-five to thirty short, bristle-shaped feet, which are slightly curved, convergent, and in the upper half connected by a solid ring.
Dimensions.—Cephalis 0.02 long, 0.02 broad; thorax 0.09 long, 0.08 broad.
Habitat.—Fossil in Barbados.
18. Carpocanium dactylus, n. sp.
Shell slenderly ovate, twice as long as broad, with flat, perfectly hidden cephalis. Length of the two joints = 1 : 12, breadth = 4 : 8. Pores subregular, circular, as broad as the bars, in about twelve longitudinal rows, separated by prominent longitudinal ribs. Mouth constricted, two-thirds as broad as the thorax. Peristome with twelve large, lanceolate, lamellar, convergent feet.
Dimensions.—Cephalis 0.01 long, 0.04 broad; thorax 0.12 long, 0.08 broad.
Habitat.—South Pacific, Station 295, depth 1500 fathoms.
19. Carpocanium irregulare, n. sp. (Pl. 52, fig. 14).
Shell irregular, roundish, subovate, with flat and oblique, perfectly hidden cephalis. Length of the two joints = 1 : 10, breadth = 3 : 9. Pores irregularly scattered, roundish, about as broad as the bars. Mouth wide open, not at all or little constricted. Peristome with twenty to thirty long, lamellar, pointed feet, which are irregularly curved and convergent.
Dimensions.—Cephalis 0.01 to 0.02 long, 0.03 to 0.04 broad; thorax 0.09 to 0.11 long, 0.08 to 0.09 broad.
Habitat.—Central Pacific, Station 263 to 274, surface, and at various depths.
20. Carpocanium verecundum, n. sp. (Pl. 52, figs. 12, 13).
Shell ovate, smooth, with flat, perfectly hidden cephalis (fig. 12). Length of the two joints = 1 : 9, breadth = 4 : 9. Pores subregular, circular, twice as broad as the bars, in about eighteen,
