Dimensions.—Length of the shell (with ten joints) 0.22; length of the largest (fifth joint) 0.03, breadth 0.09.
Habitat.—Central Pacific, Stations 270 to 274, depth 2350 to 2925 fathoms.
21. Eucyrtidium scalarium, n. sp.
Shell smooth, slender, ovate, with nine to ten deep strictures, and ten to eleven separate step-like joints of different lengths. The sixth joint is the longest, twice as long as the fourth, and three times as long as the third and the last joint; the seventh and eighth joints are the broadest, one and a half times as broad as the wide mouth. Cephalis hemispherical, with a short pyramidal horn of the same length. Pores small and numerous, subregular, square, in regular transverse rows; six rows in the sixth joint, three rows in the last joint. (Somewhat similar to Spirocyrtis scalaris, Pl. [76], fig. 14, but ovate, not conical and not spiral.)
Dimensions.—Length of the shell (with eleven joints) 0.22, breadth 0.11; length of the last joint 0.01, of the sixth 0.03.
Habitat.—North Atlantic, Station 64, surface.
Subgenus 4. Acanthocyrtis, Haeckel, 1881, Prodromus, p. 437.
Definition.—Joints of the shell of very different lengths. Surface spiny.
22. Eucyrtidium tricinctum, n. sp. (Pl. [78], fig. 13).
Shell spiny, spindle-shaped, with three distinct strictures. Four joints of different lengths, the first and third half as long as the second and fourth; the third joint is the broadest, four times as broad as the strongly constricted mouth. Spines irregularly scattered over the lower half of the shell, increasing in size towards the mouth. Pores subregular, circular.