144 BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



Axial ribs not very regularly spaced. 



Junctions of axial ribs and spiral cords forming tufts gabbi 



Junctions of axial ribs and spiral threads not forming tufts. 

 Junctions of axial ribs and spiral threads strongly 



spinose crossei 



Junctions of axial ribs and spiral threads not 



strongly spinose tentorium 



Shell not helicoid, but of turbinid outline. 



Axial ribs bearing strong spines abbotti 



Axial ribs bearing feeble spines rosaliae 



ABBOTTELLA WILHELMI (Pfelffer) 



Plate 24, Figures 1-3 



1858. Choanopoma wilheltni Pfeiffer, Malak. Blatter, vol. 5, p. 139, pi. 2, figs. 1-3. 

 1920. Abbottella wilheltni Henderson and Bartsch, Proc. U. S. Nat. Mus., vol. 

 58, p. 75. 



Shell depressed-helicoid, pale brown. Nuclear whorls 1.5, well rounded, 

 minutely granulose. Postnuclear whorls strongly rounded and marked 

 by retractively curved axial ribs, of which 98 are present on the last 

 whorl. The spiral sculpture consists of slender threads of which three 

 are present on the first turn, four on the second, and eight on the last. 

 The junction of the axial and spiral sculpture produces hispid cusps. 

 Suture rather deeply channeled. Periphery well rounded. Base strongly 

 rounded, very broadly umbilicated, and marked by the continuation of 

 the axial ribs and 10 spiral cords, of which stronger and weaker alter- 

 nate. The umbilical wall also shows the continuation of the axial ribs 

 and six strong spiral cords. Both on the base and on the umbilical wall 

 the junction of the axial ribs and spiral threads produces decided 

 nodules. Aperture almost circular; peristome double, the inner slightly 

 exserted ; the outer broadly flaringly expanded and marked by numerous 

 concentric lines and radiating brown color markings. Operculum typically 

 abbottellid. 



The specimen figured (U.S.N.M. No. 529441) was received from 

 Fulton. It has 4.5 whorls and measures: Height, 5.8 mm.; greater di- 

 ameter, y.y mm.; lesser diameter, 6.2 mm. Pfeififer's type came from 

 Puerto Plata, Dominican Republic. It is most likely that our specimens 

 came from the same source. 



U.S.N.M. No, 504089 contains 2 additional specimens from the same 

 source. 



ABBOTTELLA NEWCOMBI (Crosse) 



Plate 24, Figures 7-9 



1873. Choanopoma neivcombi Crosse, Journ. Conchyl., vol. 21, p. 352. 



1874. Choanopoma newcomhi Crosse, Journ. Conchyl., vol. 22, p. 82, pi. 3, 



figs. 1, la. 

 1920. Abbottella newcombi Henderson and Bartsch, Proc. U. S. Nat. Mus., vol. 

 58, p. 75. 



Shell depressed-helicoid, pale brown, with the peristome slightly paler. 



