Definition.—Surface of the shell smooth or rough, without radial spines.
1. Spongoliva cerasina, n. sp.
Cortical shell one and a fourth times as long as broad, with smooth surface, four times as broad as the outer spherical medullary shell. Spongy framework very compact, with very small meshes, its thickness equal to the diameter of the outer medullary shell.
Dimensions.—Length of the cortical shell 0.2, breadth 0.16; thickness of its wall 0.04; diameter of the outer medullary shell 0.04, of the inner 0.014.
Habitat.—Fossil in the rocks of Barbados.
2. Spongoliva prunulina, n. sp.
Cortical shell one and a third times as long as broad, with smooth surface, three times as large as the outer ellipsoidal medullary shell. Spongy framework very compact, with small meshes, its thickness equal to the diameter of the inner medullary shell.
Dimensions.—Length of the cortical shell 0.24, breadth 0.18; thickness of its wall 0.03; size of the outer medullary shell 0.08 to 0.06, of the inner 0.03.
Habitat.—Pacific, central area, Station 265, depth 2900 fathoms.
3. Spongoliva persicina, n. sp.