1. Dendrospyris stylophora, Haeckel.
Ceratospyris stylophora, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 66, Taf. xx. fig. 10.
Shell nut-shaped, thorny, with subregular circular pores. Basal plate with four pores. Apical horn and the two divergent feet straight, cylindrical, larger than the shell, forked at the distal end. (The size and number of the fork-branches is variable; the horn is sometimes simple. In some specimens a rudimentary remnant of the lost caudal foot is visible.)
Dimensions.—Shell 0.08 long, 0.09 broad; horn and feet 0.1 to 0.12 long.
Habitat.—Fossil in Barbados.
2. Dendrospyris dirrhiza, Haeckel.
Ceratospyris dirrhiza, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 66, Taf. xx. fig. 9.
Shell nut-shaped, spiny, very similar to the preceding species. It differs from that mainly in the growth of the cylindrical feet, which are not straight and divergent, but more or less curved and convergent; their distal ends are sometimes simply forked, sometimes repeatedly dichotomous. The size and form of the apical horn are also very variable.
Dimensions.—Shell 0.06 long, 0.08 broad; horn and feet 0.07 to 0.09 long.
Habitat.—Fossil in Barbados.