N. angulifera. Three syntypes in the B.M.N.H. No. 197312; illustrated syntype 17.4 x 10.4 X 8.7 mm. Creamy-white in colour with traces of brown bands near the suture and base, penultimate whorl with 14 axial ribs and 9 overriding spiral threads, body whorl with 14 ribs and 19 spiral threads, columella finely plicate along its entire length. Galapagos Is, 10 fathoms (18 m).

There appears to be some confusion as to the identity of the species. Tomlin (1932) considered N. anguliferus to be a synonym of the Mediterranean-West African N. miga (Bruguiere, 1789), while Keen (1971) tentatively placed the species in the synonymy of N. dentifer (Powys). N. anguliferus does not resemble N. dentifer while N. miga has evenly convex whorls and oblique axial ribs and lacks the adpressed sutures, concave platform anteriorly to the sutures, the angulate pre-sutural ramp and fine plicae on the columella of N. anguliferus. However, small individuals of N. pagodus (Reeve, 1844) from the west coast of America closely resemble the types of N. anguliferus. Larger series of specimens of N. pagodus, not at the writer's disposal, are required to confirm the supposition that N. anguliferus may fall within the variational range of N. pagodus.