Caecum vertebrale Hedley, 1899. Length, 2.0 mm; diameter, 0.5 mm. Shell: tubular, slightly curved; with 22 to 25 moderately strong, rounded transverse rings separated by interspaces of about equal breadth and depth; aperture with a single larger ring; septum strongly convex. Color: light brown. This species is rather infrequently found, at depths of about 30 m.
C. vertebrale was described from Funafuti and has been reported from Pleistocene drill holes in Tonga and at Enewetak, Marshall Islands (Ladd, 1972).