Dimensions.—Length of the shell 0.09, breadth 0.07.
Habitat.—South Pacific, Station 285, depth 2375 fathoms.
4. Acrobotrys acuminata, n. sp. (Pl. [96], fig. 9).
Cephalis sexlobate, with two divergent tubes. Occipital and frontal lobes ovate, odd; between them a cupola-shaped apical lobe, bearing an ascending pointed apical tube. On each side at the base a small buccal lobe, and between the paired buccal lobes an anterior nasal lobe with a descending curved sternal tube. Thorax smaller than the cephalis. Pores numerous and small.
Dimensions.—Length of the shell 0.11, breadth 0.09.
Habitat.—Central Pacific, Station 272, depth 2600 fathoms.
5. Acrobotrys auriculata, n. sp. (Pl. [96], fig. 11).
Cephalis quadrilobate, with three pointed and auriculate tubes, two ascending apical (an anterior and a posterior) in the helmet-shaped occipital lobe, and a descending sternal tube on the base of the frontal lobe; between the lobes two lateral paired buccal lobes. Thorax campanulate, twice as broad as the cephalis. Pores rather large and numerous.
Dimensions.—Length of the shell 0.1, breadth 0.08.
Habitat.—Central Pacific, Station 271, depth 2425 fathoms.