178 BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



last turn. Of these spiral cords, the one at the shoulder is broader than 

 the rest, and here the axial riblets are expanded into scallops which 

 strongly denticulate the summit. The junctions of the axial ribs and 

 spiral threads on the rest of the shell form elongated nodules which 

 have their long axis parallel with the axial sculpture. Suture deeply and 

 broadly channeled. Periphery well rounded. Base moderately long, well 

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

 axial ribs and eight spiral threads equaling those on the spire. The um- 

 bilical wall, which is also crossed by the enfeebled axial ribs, bears 12 

 spiral threads, which are stronger than those on the base. Aperture 

 broadly oval; peristome double, the outer broadly expanded at the junc- 

 tion of the basal and inner lip, forming a conspicuous auricle at the 

 posterior angle, narrow on the outer lip and parietal wall and marked by 

 concentric lamellae; the inner strongly exserted and decidedly reflected 

 at the outer and basal lip. Operculum unknown. 



The type (U.S.N.M. No. 403807) was collected by C. R. Orcutt at 

 Petit Goave, Haiti, on the north coast of the south peninsula. It has 

 3.7 whorls remaining and measures : Height, 23.0 mm. ; greater diame- 

 ter, 17.8 mm. ; lesser diameter, 11. 9 mm. 



U.S.N.M. No. 403053 contains 9 topotypes. 



INCEBTIPOMA MABINUM (Reeve) 



Plate 31, Figure 1 

 1863. Chondropoma marirmm Reeve, Conchologia iconica, vol. 14, pi. 8, No. 57. 



Shell rather compressedly umbilicated, oblong-turrited, fulvous, longi- 

 tudinally streaked with double rows of chestnut dots, banded at the base ; 

 whorls convex, longitudinally densely thread-ridged, crenulated at the 

 sutures; aperture obliquely ovate, a little expanded, rayed. 



Habitat: Island of Haiti (Weinland). 



The above description and my figure are copied from Reeve, who 

 cites Weinland as the author of the name as published in the Malako- 

 zoologische Blatter for 1862. I have been unable to find such a descrip- 

 tion. Pfeififer and others have referred this to Sallepoma emiliamim 

 (Weinland), with which determination I cannot agree, for Reeve plainly 

 figures a shell with rayed peristome. Until a reexamination of Wein- 

 land's type can be made, it will be impossible even to suggest the super- 

 specific affinity of the shell. For this reason I have placed it in the catch- 

 all, Incertiponia. 



INCEBTIPOMA SAMANICOLtTM, new species 



Plate 31, Figure 4 



Shell elongate-conic, yellowish. Nuclear whorls decollated in all our 

 specimens. Postnuclear whorls marked by low, depressed axial ribs, 

 which are irregular in strength, spacing, and development and which 



