Dimensions.—Length of the shell (with six joints) 0.18, breadth 0.08. Length of the first joint 0.02, the second 0.04, the three following 0.02, the sixth 0.06.
Habitat.—North Pacific, Station 241, depth 2300 fathoms.
5. Cyrtophormis acutata, Haeckel.
Eucyrtidium acutatum, Stöhr, 1880, Palæontogr., vol. xxvi. p. 105, Taf. iv. fig. 11.
Shell rough, spindle-shaped, with six annular strictures. The third, fourth, and seventh joints are equal in length, three times as long as the first and the fifth joints. The fourth joint is the broadest, four times as broad as the constricted mouth. Pores irregular, roundish. Cephalis small, subspherical, with a short conical horn. Peristome with nine (?) irregular, triangular, little convergent teeth.
Dimensions.—Length of the shell (with seven joints) 0.22, breadth 0.11. Length of the third, fourth, and seventh joints 0.04.
Habitat.—Fossil in Tertiary rocks of Sicily; Grotte (Stöhr).
Subgenus 3. Acanthocyrtis, Haeckel.
Definition.—Shell with numerous (twelve to twenty or more) terminal feet.
6. Cyrtophormis cylindrica, n. sp. (Pl. [77], fig. 17).