Dictyospyris reticulata, Ehrenberg, 1872, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 289, Taf. x. fig. 19.
Shell thorax-shaped, one and one-fifth times as long as broad, with a deep sternal incision and two distinct transverse strictures. On each side of the ring-plane three pairs of large annular holes of nearly equal size, about one-third as long as the shell. No zygomatic bars between the orbital and maxillary bars. Lateral girdle narrow, with few large polygonal meshes.
Dimensions.—Shell 0.18 long, 0.15 broad.
Habitat.—Indian Ocean, Zanzibar, depth 2200 fathoms (Pullen).
Subgenus 2. Amphispyridium, Haeckel.
Definition.—On each side of the ring-plane four pairs of larger annular meshes; a middle horizontal zygomatic ring is developed between the two tympanic transverse rings (superior orbital and inferior maxillary ring).
4. Amphispyris sternalis, n. sp. (Pl. [88], fig. 2).
Shell thorax-shaped, one and one-fifth times as long as broad, with deep sternal incision and two distinct transverse (tympanic) strictures. On each side of the ring-plane four pairs of large irregular, annular holes; the fourth (inferior or buccal) pair is the longest. The middle of the sagittal ring is crossed by horizontal zygomatic bars (between the ascending orbital and the descending maxillary bars). Lateral lattice-girdle narrow, with few large meshes.
Dimensions.—Shell 0.24 long, 0.2 broad; ring 0.09 long.
Habitat.—Central Pacific, Station 271, depth 2425 fathoms.