NEW ANTILLEAN MOLLUSKS — REHDER 191 



This species differs from other Antillean members of this genus 

 in the distinctive color pattern and its broad shape, constricted at 

 both ends. 



HALOPSEPHUS, 1 new genus 



Shell small, solid, broadly conical, smooth, imperforate. Oper- 

 culum calcareous, externally convex, sculptured by one whorl of axial, 

 retractively curved, rugose riblets, which begin at the elevated nuclear 

 portion, where they do not reach the margin, and gradually lengthen 

 and reach the margin. Since the tops of these riblets are flush with 

 the convex surface of the operculum, the sculpture has the appearance 

 of curved, radial, vermiculiform grooves, irregular in the center of 

 the operculum. 



Type : Halopsephus pulcher, new species. 



This interesting genus of Turbinidae differs markedly from all 

 other Atlantic groups in its smooth shining surface and in its 

 peculiarly sculptured operculum. It may be near Taenioturbo Wood- 

 ring, 1928 (genotype: Turbo canaliculatus Hermann), a question 

 that the knowledge of the operculum of the latter species will help to 

 solve. 



HALOPSEPHUS PULCHER, new species 



Plate 20, Figures 3, 10 



Shell small, solid, broadly conical, of 5^4 whorls. Nuclear whorls 

 planate, not sharply differentiated from the postnuclear whorls, with 

 a sharply keeled periphery, the keel bearing broad, horizontally flat- 

 tened spines, giving the early whorls a stellate appearance when 

 viewed from above; these spines disappear in the early postnuclear 

 whorls. Later whorls convex, smooth, except for some narrow, low, 

 more or less obscure, spiral ridges in the supraperipheral area, 

 appressed in the sutural region to the preceding whorl. The nuclear 

 whorls are pale scarlet, the later whorls becoming cinnamon-rufous 

 to apricot-orange, lighter on the base. There are irregular radial 

 white maculations running from the suture down over half of the 

 supraperipheral area, and other white spots of various shapes in 

 numerous spiral rows of different widths over the whole shell; on 

 the periphery and also below the periphery are rows of white macu- 

 lations, for instance, that resemble Arabic characters. Umbilical 

 region indented but imperforate. Aperture circular, outer lip thin, 

 simple; columellar lip evenly curved, thickened, slightly reflexed. 

 Operculum as in generic diagnosis above. 



The type, U.S.N.M. No. 500638, measures: Height, 11.2 mm.; 

 breadth, 11 mm. It was dredged off Lazaretto, Barbados, in shallow 



1 aX6r, sea + ^7j<£os, pebble. 



