HISPANIOLAN AND BAHAMAN ANNULARIIDAE 145 



Nuclear whorls 1.6, well rounded, minutely granulose. Postnuclear 

 whorls strongly rounded and marked by numerous closely crowded axial 

 riblets, of which 262 are present on the last turn. In addition to the axial 

 riblets, the whorls are marked by strong spiral threads, of which 19 are 

 present on the last turn between summit and periphery. The junction 

 of the axial ribs and the spiral threads forms minute tubercles, those on 

 the first keel below the summit being more elongate and stronger than 

 the rest. Suture deeply channeled. Periphery well rounded. Base well 

 rounded and marked by the continuation of the axial ribs and 17 spiral 

 threads equaling those on the spire in strength; the umbilical wall also 

 is marked by the continuation of the axial ribs and spiral cords, which 

 vary in strength, heavy ones alternating with one or more of the weaker; 

 there are 11 in all. The base is broadly openly umbilicated. Aperture al- 

 most circular, somewhat oblique ; peristome double, the inner slightly ex- 

 serted; the outer flaringly expanded, a little wider on the outer lip than 

 on the inner and parietal wall, forming a broad auricle at the posterior 

 angle. Operculum typically abbottellid. 



The specimen figured (U.S.N.M. No. 57302) is one of two received 

 from Newcomb with the designation "Santo Domingo." It has 4.5 whorls 

 and measures : Height, 5.5 mm. ; greater diameter, 9.7 mm. ; lesser diame- 

 ter, 7.2 mm. 



ABBOTTEL.L.A HAITENSI8, new species 



Plate 24, Figures 10-12 



Shell very depressed-helicoid, flesh-colored, marked by interrupted 

 spiral bands of brown arranged also in axial series and rendering the 

 outer peristome rayed. Nuclear whorls 1.5, well rounded, depressed. 

 Postnuclear whorls strongly rounded, marked by strong lamellar axial 

 ribs between which a number of finer hairlike axial threads are present. 

 The last whorl bears 60 of the stronger ribs. Of the feeble spiral threads, 

 10 are present between the summit and the periphery. The junctions of 

 the axial ribs and spiral threads form feeble, elongate nodules, with their 

 long axis parallel with the axial sculpture. The first row of these nodules 

 renders the suture slightly crenulated. Suture channeled. Periphery 

 strongly rounded. Base strongly rounded, very broadly openly umbili- 

 cated, and marked by the continuation of the axial ribs, which pass over 

 the base and on the umbilicus almost undiminished. The spiral threads 

 here are a trifle stronger than on the spire and there are six present on 

 the base and 7 on the umbilical wall. Aperture subcircular; peristome 

 double, the inner decidedly exserted, the outer broadly expanded on the 

 outer lip, less so on the inner lip and marked by slender concentric 

 lamellae. 



The type (U.S.N.M. No. 504111) was collected by Dr. W. L. Abbott 



