Subgenus 2. Tricolocamptra, Haeckel.
Definition.—Pores of the thorax and the abdomen of different sizes or forms.
7. Tricolocampe urnula, n. sp. (Pl. [66], fig. 22).
Shell cylindrical, with obtuse conical apex, smooth. Length of the three joints = 2 : 3 : 10, breadth = 2 : 3 : 6. Cephalis subspherical. Thorax barrel-shaped. Abdomen cylindrical with slightly constricted wide mouth. Pores irregular, roundish, three to four times as broad in the abdomen as in the thorax, irregularly disposed.
Dimensions.—Length of the three joints, a 0.02, b 0.03, c 0.1; breadth, a 0.025, b 0.035, c 0.06.
Habitat.—Central Pacific, Stations 270 to 274, depth 2350 to 2925 fathoms.
8. Tricolocampe doliolum, n. sp.
Shell cylindrical, with hemispherical apex, rough. Length of the three joints = 1 : 3 : 5, breadth = 1 : 2 : 3. Cephalis spherical. Thorax and abdomen cylindrical, of nearly equal breadth. Mouth widely open, not constricted. Pores irregular, roundish, in the abdomen three to four times as large as in the thorax, disposed in oblique rows.
Dimensions.—Length of the three joints, a 0.03, b 0.09, c 0.16; breadth, a 0.03, b 0.05, c 0.09.
Habitat.—Fossil in Barbados.