7. Theocyrtis macroceros, n. sp. (Pl. [69], fig. 13).
Shell almost cylindrical, smooth. Length of the three joints = 1 : 2 : 5, breadth = 2 : 3 : 4. Cephalis hemispherical, with a very large cylindrical horn, once or twice as long as the shell. Thorax truncate, hemispherical. Abdomen cylindrical, only slightly contracted towards both ends. Two girdle strictures deep. Pores small, subregular, circular, more irregular and twice to three times as large in the abdomen as in the thorax, disposed in transverse rows, five to six in the thorax, eight to ten in the abdomen.
Dimensions.—Length of the three joints, a 0.02 to 0.03, b 0.04 to 0.05, c 0.1 to 0.12; breadth, a, 0.04, b 0.07, c 0.08.
Habitat.—South Atlantic, Station 335, depth 1425 fathoms; also fossil in Barbados.
8. Theocyrtis ptychodes, n. sp. (Pl. [69], fig. 8).
Shell almost cylindrical, smooth. Length of the three joints = 1 : 3 : 3, breadth = 2 : 4 : 4. Cephalis hemispherical, with a large, conical, curved horn of twice the length. Thorax very large, inflated, campanulate, thick-walled. Abdomen cylindrical, with a thin folded wall (like a petticoat), the thickness of which decreases gradually towards the wide truncate mouth. Pores subregular, circular, and quincuncially disposed in the two first joints, irregular and larger in the abdomen, forming longitudinal series between the folds.
Dimensions.—Length of the three joints, a 0.04, b 0.1, c 0.11; breadth, a 0.05, b 0.12, c 0.12.
Habitat.—Central Pacific, Station 272, depth 2600 fathoms.
9. Theocyrtis aspera, Haeckel.
Eucyrtidium asperum, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 70, Taf. viii. fig. 15.