Subgenus 1. Carpocanarium, Haeckel.
Definition.—Peristome-corona composed of six feet (three primary perradial alternating with three secondary interradial).
1. Carpocanium calycodes, Stöhr.
Carpocanium calycodes, Stöhr, 1880, Palæontogr., vol. xxvi. p. 96, Taf. iii. fig. 8.
Shell urceolate, smooth, nearly twice as long as broad, with hemispherical vaulted cephalis. Length of the two joints = 3 : 16, breadth = 5 : 10. Pores regular, circular, as broad as the bars, quincuncially disposed in about five longitudinal series at each side. Mouth constricted, half as broad as the thorax. Peristome with six vertical, equilateral, triangular feet.
Dimensions.—Cephalis 0.015 long, 0.025 broad; thorax 0.08 long, 0.05 broad.
Habitat.—Fossil in Tertiary rocks of Sicily (Grotte, Caltanisetta).
2. Carpocanium setosum, Haeckel.
Halicalyptra setosa, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 160, Taf. ii. fig. 12.
Shell ovate, truncate at the mouth, thorny, exactly as long as broad. Length of the two joints = 1 : 8, breadth = 3 : 9. Cephalis hidden, with very small pores. Thorax inflated, with regular, circular pores, twice as broad as the bars, in about ten longitudinal series at each side. Mouth constricted, half as broad as the thorax. Peristome with six vertical, parallel, broad, lamellar, rectangular feet, separated by equal internals, half as long as the shell.