160 BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



WEINLANDIPOMA EXCISUM, new species 



Plate 28, Figure 1 



Shell elongate-ovate, flesh-colored. Nuclear whorls decollated in all 

 our specimens. Postnuclear whorls inflated, strongly rounded, and 

 marked by lamellar axial ribs, which are weakly scalloped. Of these 

 axial ribs, 41 are present on the last turn. Between the lamellar axial 

 ribs one or two finer axial threads may be present. The intercostal spaces 

 are marked by closely spaced, feeble spiral hairlines, which are about 

 as wide as the spaces that separate them and become apparent only under 

 high magnification. Suture strongly constricted. Periphery well rounded. 

 Base moderately broadly openly umbilicated and marked by the continua- 

 tion of the axial ribs and by two slightly stronger scallops at the outer 

 edge of the umbilicus. The ribs of the umbilical wall bend toward the 

 scallops. Aperture circular; peristome double, the inner exserted; the 

 outer broadly, flaringly expanded, of wavy outline, with a decidedly 

 reflected, broad notch at the parietal wall which leaves the peristome of 

 the posterior angle of the aperture and the inner lip point of the sinus, 

 standing out as horns; the outer peristome is marked by slender con- 

 centric lamellae. Operculum? (The shell characters, however, indicate 

 that this species belongs in W einlandipoma.) 



The type (U.S.N.M. No. 504136) was collected by C. R. Orcutt on a 

 hill east of Morne Rouge, Haiti, on the south coast of the west penin- 

 sula. It has 3.5 whorls remaining and measures: Height, 10.4 mm.; 

 greater diameter, 7.2 mm. ; lesser diameter, 5.2 mm. 



U.S.N.M. No. 402668 contains 2 topotypes. 



WELNL.ANDIPOMA STRICTECOSTATCM (Maltzan) 



Plate 28, Figure 7 



1888. Choanopoma sfrictecostatum Maltzan, Nachr. deutschen malak. Ges., vol. 



20, p. 181. 

 1891. Choanopoma stride costatum Crosse, Journ. Conchyl., vol. 39, p. 169. 



Shell broadly conic, flesh-colored, with faint interrupted spiral bands 

 of brown; the peristome is weakly rayed with brown. Nuclear whorls 

 2.2, inflated, well rounded, forming a rather pointed apex. Postnuclear 

 whorls inflated, strongly rounded, and marked by distantly spaced, 

 slender, lamellar axial ribs, of which 41 are present on the last turn. 

 These ribs are weakly scalloped at their free edge. Of these scallops, 

 five are present on the first and second turns and six on the last between 

 summit and periphery ; the scallop at the summit of the turns is broader 

 than the rest. Between these lamellar axial ribs a slender hairlike thread 

 or several of them may be present. The broad intercostal spaces are 

 marked by numerous, very fine, closely spaced spiral striations. Suture 

 strongly constricted. Periphery inflated, strongly rounded. Base short. 



