174 BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



13 mm. (Cuming Collection.) Operculum unknown. Habitat, Island of 

 Santo Domingo. 



The above description is a translation of Pfeiffer's as published in 

 Martini-Chemnitz. 



I have seen nothing from Hispaniola that fits Pfeiffer's description 

 and figure. The spiral cords on the umbilical wall rule out Rolleia, which 

 it otherwise resembles. Of Abbottella, on the other hand, we have seen 

 no specimens without spiral threads on the spire. 



INCEBTIPOMA r.AMEr,L,OSUM, new species 



Plate 29, Figure 8 



Shell of turbinid outline, buff, with four bands of brown between the 

 summit and the periphery and four on the base. Nuclear whorls? Post- 

 nuclear whorls decidedly inflated and very strongly rounded and marked 

 by strong lamellar axial ribs, of which ^6 are present on the last whorl; 

 between these finer axial threads are present. The finer threads may 

 vary from one to five. The spiral sculpture consists of fine threads that 

 render the axial ribs conspicuously nodulose, almost spinose. Of these 

 spiral threads, five are present on the antepenultimate turn between the 

 summit and the suture, while on the last turn 10 occupy the same space. 

 Suture very strongly constricted. Base short, very openly umbilicated, 

 strongly rounded, and marked by the continuation of the axial ribs, which 

 also pass over the umbilical wall. The base bears three strong spiral cords, 

 and on the umbilical wall 11 additional spiral threads are present. On the 

 base and umbilical wall the junctions of the axial ribs and spiral threads 

 form nodules, but not as conspicuous as those on the spire. The last 

 whorl is solute for about one-quarter of a turn. Aperture circular; 

 peristome double, the outer broadly flaringly expanded and marked by 

 concentric lamellae ; the inner is decidedly exserted and very slightly re- 

 flected. Operculum ? 



The type (U.S.N. M. No. 504144) was collected by Dr. W. L. Abbott 

 at Trou de Bon Dieu near Port de Paix, Haiti. It has 4.7 whorls re- 

 maining and measures: Height, 11. o mm.; greater diameter, 8.7 mm.; 

 lesser diameter, 6.5 mm. 



It seems a pity that we do not possess the necessary information to 

 enable me to allocate this splendid species in its proper systematic posi- 

 tion in the family. 



INCEBTIPOMA VIBII.E, new species 



Plate 30, Figure 8 



Shell elongate-ovate, yellowish white. Nuclear whorls decollated in all 

 our specimens. Postnuclear whorls strongly rounded, very narrowly shoul- 

 dered at the summit and marked by rather weak, almost vertical axial 

 riblets, of which 112 are present on the last whorl. These ribs are low and 

 rounded and vary somewhat in spacing and strength. Suture rendered 



