Subgenus 2. Cyrtocapsoma, Haeckel.
Definition.—Shell with four or more annular septa, and five or more joints.
8. Cyrtocapsa incrassata, Haeckel.
Eucyrtidium incrassatum, Stöhr, 1880, Palæontogr., vol. xxvi. p. 105, Taf. iv. fig. 9.
Shell rough, spindle-shaped, with four annular septa. Length of the five joints = 2 : 3 : 4 : 4 : 4. The third joint is the broadest, nearly three times as broad as long. The fourth joint is inversely conical, acute. Cephalis small, spherical, with two short, conical, divergent horns. Pores small, regular, circular.
Dimensions.—Length of the shell (with five joints) 0.17, breadth 0.11. Length of the single joints, a 0.015, b 0.035, c 0.04, d 0.04, e 0.04.
Habitat.—Fossil in Tertiary rocks of Sicily, Grotte.
9. Cyrtocapsa costata, n. sp.
Shell smooth, spindle-shaped, twice as long as broad, with numerous longitudinal ribs, and four annular septa. Length of the five joints = 1 : 4 : 3 : 2 : 8. The third joint is the broadest. Fourth joint inversely conical, acute. Cephalis small, hemispherical, with a small conical horn. Pores regular, circular.
Dimensions.—Length of the shell (with five joints) 0.18, breadth 0.09. Length of the single joints, a 0.01, b 0.04, c 0.03, d 0.02, e 0.08.