HISPANIOLAN AND BAHAMAN ANNULARIIDAE 109 



on the last whorl between the summit and the periphery, lo on the base, 

 and 12 on the umbilical wall. The junctions of the axial ribs and the 

 spiral threads form minute nodules, while the spaces enclosed between 

 them are shallow rectangular areas. Suture strongly constricted. Pe- 

 riphery inflated, strongly rounded. Base inflated, strongly rounded, 

 openly umbiHcated. The last whorl is solute for about one-fourth of a 

 turn. Aperture oval; peristome double, the outer a little wider on the 

 anterior portion of the inner lip, narrower on the basal and outer lip 

 and narrowest on the parietal wall, forming an inconspicuous auricle at 

 the posterior angle; the outer peristome is slightly fluted; the inner 

 peristome is strong, strongly exserted, and slightly reflected. Operculum ? 



The type (U.S.N.M. No. 504036) was collected by A. J. Poole, in a 

 cave at L'Atalaye Plantation, 3 miles west of St. Michel, Haiti. It has 

 3.9 whorls remaining and measures : Height, 14.2 mm. ; greater diameter, 

 7,8 mm. ; lesser diameter, 6.7 mm. 



U.S.N.M. No. 504037 contains 2 additional specimens collected by 

 Mr. Poole in a cave i mile northwest of St. Michel. 



HAITIPOMA AMINENSE (Pfeiflfer) 



Plate 16, Figure 2 



1858. Cyclostomus aminensis Pfeiffer, Malak. Blatter, vol. 5, p. 140. 

 1888. Colobostylus aminensis Crosse and Fischer, Journ. Conchyl., vol. 36, p. 234. 

 1920. Farachondria (Parachondria) aminensis Henderson and Bartsch, Proc. 

 U. S. Nat. Mus., vol. 58, p. 66. 



Shell elongate-ovate, yellowish brown. Nuclear whorls decollated in 

 all our specimens. Postnuclear whorls inflated, narrowly shouldered at 

 the summit, marked by retractively slanting, closely spaced, sublamellar 

 axial riblets, of which 106 occur on the first turn, 148 on the second, 

 and 160 on the last. These riblets are about as wide as the spaces that 

 separate them and become slightly expanded at the summit. At fairly 

 close intervals two or three of them become fused into conspicuous 

 tufts, which crenulate the suture. The spiral sculpture consists of rather 

 strong cords, of which six occur on the first of the remaining turns, 

 seven on the second, and eight on the last. The axial riblets appear as 

 if superimposed on the spiral cords, and the junction on the two forms 

 slender elongated nodules having their long axis parallel with the axial 

 sculpture. The spaces enclosed between them are elongated pits also hav- 

 ing their long axis parallel with the axial sculpture. The axial riblets 

 vary somewhat in strength and spacing, the heavier ones being succeeded 

 by finer riblets, which are more closely spaced. Suture channeled. Pe- 

 riphery inflated, strongly rounded. Base short, openly umbilicated, 

 inflated, well rounded, marked by the continuation of the axial riblets 

 and five strong spiral cords. In addition to that, eight spiral cords are 

 present on the umbilical wall. Last whorl solute for about one-fourth of 

 a turn. Aperture very broadly oval, almost subcircular ; peristome double. 



