Rlssoina Ambigua, Gould.

Gould, Moll., U.S. Explor. Exped., p. 217, pl. xv., figs. 261a-c; Tryon, Man. Conch., ix., 1887, p. 371, pl. lv., figs/27, 29, 31, 35; pl. liv., fig. 7.

A few worn specimens were collected on the lagoon beach. They belong to a variety with smaller and more numerous ribs on the last whorl than the type.

This is one of the most abundant and widespread species in the Pacific. It was first found in the Paumotus Group. I have seen specimens from Tahiti. Pease found it in the Hawaiian and Garrett in the Fijian Islands. I have collected it in Port Moresby, New Guinea, and again at Panie, New Caledonia.