Genus Clavulina, d'Orbigny.
Clavulina communis, d'Orbigny.
Clavulina communis, d'Orbigny, 1826, Ann. Sci. Nat., vol. vii, p. 268, No. 4. Brady, 1884, Rep. Chall., vol. ix, p. 394, pl. xlviii, figs. 1–13.
This species is not at all common, but typical specimens occur, measuring about 3 mm. in length. It has been already recorded form the Southern Ocean, and is more commonly found in the Southern Hemisphere.