HISPANIOLAN AND BAHAMAN ANNULARIIDAE 



163 



the umbilicus three lesser scallops are present. Last whorl solute for 

 one-third of a turn. Aperture circular; peristome double, the inner 

 slightly exserted and slightly reflected; the outer moderately, broadly 

 expanded, narrower on the parietal wall than on the rest, marked by 

 a series of prominent concentric lamellae. Operculum with central 

 nucleus and a moderately elevated, obliquely reflected, spiral lamella. 



The specimen described and figured (U.S.N.M. No. 35594o) was 

 collected by John B. Henderson and the author at Port-au-Prince, Haiti, 

 the type locality. It has 4 whorls remaining and measures : Height, 7-9 

 mm. ; greater diameter, 4.9 mm. ; lesser diameter, 3.9 mm. 



U.S.N.M. No. 355940 contains 112 topotypes, 100 of which yield the 

 following average measurements : 



U.S.N.M. No. 355941 contains 118 specimens collected by Henderson 

 and Simpson at Port-au-Prince. 



U.S.N.M. No. 355938 contains 17 specimens collected by Henderson 

 at Petit Gonave Island. 



U.S.N.M. No. 380271 contains 4 specimens collected by Eyerdam one- 

 half mile north of Miragoane. 



This species is nearest related to Weinlandipoma orcutti, from which 

 its feeble axial ribs and the stronger auricles at the summit will readily 

 differentiate it. 



WEINI.ANDIPOMA MIL,1.EBI, new species 



Plate 28, Figure 9 

 Shell very small, ovate, thin, semitranslucent, flesh-colored, with mere 

 indications of interrupted spiral bands of brown and very feeble rays 

 of brown on the outer peristome. Nuclear whorls 2, strongly rounded, 

 forming a somewhat mammillated apex. Postnuclear whorls inflated, 

 strongly rounded, and marked by slender lamellose axial riblets, of 

 which 52 are present on the last turn in the type. Under high magnifica- 

 tion the intercostal spaces show microscopic lirations. Suture decidedly 

 constricted. Periphery strongly rounded. Base moderately long, strongly 

 rounded, openly umbilicated and marked by the continuation of the axial 

 ribs which extend over the umbiHcal wall ; also by the fine spiral sculp- 

 ture. The last whorl is decidedly solute for almost half a turn. Aperture 

 almost circular ; peristome double, the inner exserted ; the outer moder- 

 ately broadly expanded on the outer lip, less so on the inner and parietal 



