"Cerion hughesi (1)  new species

(Plate 15, figs. 1-3)

Description. - Shell cylindrical, solid ribbed, tapering and rimately perfo­rated. CoIor a milky-white mottled with brown. Interior of aperture coffee ­brown. Whorls 10 to 10½, the first 2 whorls porcellaneous white and smooth, remaining whorls ribbed. The first 7 whorls tapering convexly to the acute spire. The spire is produced at an angle of 55° to 60°. Aperture subquadrate.  Parietal tooth large and centered. Columellar tooth very small and generally formed well within the aperture. Outer lip rounded, rather narrow and slightly reflected. Parietal lip slightly thickened, glazed, not producing a ridge. Sculp­ture consisting of numerous axial ribs or costae which appear nested or shingled upon one another. There are 23 to 25 on the body whorl.

Types.-Holotype, Museum of Comparative Zoology, no. 116026, Sandy Point, Savannah Sound, Eleuthera Island, Bahamas. W. J. Clench collector, April 1936. Paratypes from the same locality in the Museum of Comparative Zoology, the United States National Museum and the Museo Poey, University of Havana.

Remarks. - C. hughesi appears to be fairly close to C. eleu­therae P. and V. This new Cerion differs, however, in being some­what smaller, having a well developed marbled coloration and not having the lip reflected backwards more than the width of the lip itself. (Clench, 1952:107).

Isolated colonies of both species are rather remarkably uniform in their characters. Hybrid colonies do exist, however, in which examples of each occur as well as a multitude of specimens showing characters of each species. Hybrid colonies were found at Blue Hole Point, one mile south of Savannah Sound and at Lobster Point, one half mile southeast of Savannah Sound.

(1) Named for Commissionar John A. Hughes of Eleuthera." (Clench, 1952:107)