HISPAMOLAN AND BAHAMAN ANNULARHDAE 101 



COLONINA HAITENSIS, new species 



Plate IS, Figure 4 



Shell very elongate-ovate, pale yellowish buff ; aperture yellowish white 

 within, which is also the color of the peristome. Nuclear whorls decollated 

 in all our specimens. Postnuclear whorls moderately inflated, strongly 

 rounded, marked by very slender, closely spaced, sublamellar, retrac- 

 tively slanting axial riblets, of which 132 riblets occur on the first, 

 180 on the second, and 182 on the remaining turns. These riblets are 

 of different strength and spacing. As in other members of this group, 

 the heavier and more distantly spaced ones are followed by slender, more 

 closely spaced riblets. The ribs become slightly expanded at the summit, 

 and several of them fuse into rather conspicuous hollow cusps. The 

 spiral sculpture consists of prominent cords, of which 9 occur on the 

 first and second and 10 on the last turn between the summit and the 

 periphery. The relationship of the axial and spiral sculpture is as if the 

 spiral cords form the basal elements upon which the axial ribs were 

 superimposed. The junctions of the axial ribs and spiral cords form 

 conspicuous, narrow, elongated nodules, their long axis coinciding with 

 the axial sculpture, while the spaces enclosed between them are rec- 

 tangular narrow areas, having their long axis parallel with the ribs. 

 Suture channeled. Periphery of the last whorl inflated, strongly rounded. 

 Base rather long, strongly rounded, very narrowly umbilicated, marked 

 by 10 spiral cords and the continuation of the axial riblets. Last whorl 

 slightly solute. Aperture broadly oval; peristome double, the outer 

 strongly expanded, somewhat fluted and crenulated at the edge from the 

 posterior angle to the inner lip, forming a conspicuous auricle at the 

 posterior angle; on the inner lip it is broadest and quite hides the um- 

 bilicus when viewed squarely, although it does not cover the umbilicus; 

 the outer peristome of the parietal wall is very narrow and touches the 

 preceding whorl; the inner peristome is strongly exserted, particularly 

 so on the outer lip. Operculum as described for the genus. 



The type (U.S.N.M. No. 355333) was collected by Henderson and 

 Simpson at Cap-Hai'tien. It has a little over 3 whorls remaining and 

 measures: Height, 12.5 mm.; greater diameter, 7.0 mm.; lesser diameter, 

 6.2 mm. 



A series of 30 topotypes (U.S.N.M. No. 1629S9) yields the following 

 measurements : 



This species resembles C. moustiquensis but is in every way smaller, 

 with the outer peristome more conspicuously expanded. 



