HISPANIOLAN AND BAHAMAN ANNULARIIDAE 107 



less rectangular pits, having their long axis parallel with the axial sculp- 

 ture. Suture narrowly channeled. Periphery inflated, strongly rounded. 

 Base inflated, strongly rounded, openly umbilicated. The last whorl is 

 solute for one-fourth of a turn. Aperture oval ; peristome double, the 

 outer very narrow, a little wider on the anterior portion of the inner 

 lip than on the rest, forming a weak auricle at the posterior angle. Oper- 

 culum typically haitipomid. 



The type (U.S.N.M. No. 504033) was collected by W. J. Eyerdam 

 in the Massif du Nord on limestone rocks at Hinche, Haiti. It has 4.2 

 whorls remaining and measures: Height, 14.5 mm.; greater diameter, 

 7.2 mm. ; lesser diameter, 6.6 mm. 



U.S.N.M. No. 379923 contains 43 topotypes from the same source. 



HAITIPOMA YAQUENSE, new species 



Plate 16, Figure 11 



Shell elongate-ovate, milk-white. Nuclear whorls 2, inflated, strongly 

 rounded, microscopically granulose. Postnuclear whorls inflated, strongly 

 rounded, conspicuously shouldered at the summit, and marked by very 

 slightly retractively slanting, closely spaced, sublamellar axial riblets, of 

 which 189 are present on the last whorl ; these are of varying strength 

 and spacing, the heavier, more distantly spaced ones being followed by 

 closer spaced, narrower elements. These riblets do not become slightly 

 expanded at the summit, but at quite regular intervals two or three be- 

 come fused to form a hollow tubercle. These tubercles crenulate the 

 summit. The spiral sculpture consists of rather feeble threads, of which 

 7 occur on the first of the remaining turns and 10 on the rest. These 

 spiral threads render the axial ribs wavy but hardly nodulose. The spaces 

 enclosed between them are mere impressed lines. Suture strongly chan- 

 neled. Periphery inflated, well rounded. Base short, inflated, well rounded, 

 and marked by the continuation of the axial ribs and obsolete spiral 

 cords. Within the broad open umbilicus, however, about eight spiral 

 cords are present which are very strongly developed. Last whorl solute 

 for about one- fourth of a turn. Aperture broadly oval ; peristome double, 

 the outer narrowly expanded all around, a little more so at the junction 

 of the outer and basal lip, crenulated at the free margin, and produced 

 into a conspicuous auricle at the posterior angle ; the inner peristome 

 is exserted, a little more so on the outer than the inner lip and slightly 

 reflected. Operculum typically haitipomid. 



The type (U.S.N.M. No. 355342) was collected by Dr. W. L. Abbott 

 at Guayubin, Rio Yaque del Norte, Dominican Republic. It has a little 

 over 4 whorls and measures : Height, 14.0 mm. ; greater diameter, 

 7.5 mm. ; lesser diameter, 6.6 mm. 



