HISPANIOLAN AND BAHAMAN ANNULARIIDAE 137 



varicial streaks and vermiculations of brown; peristome pale brown, the 

 interior of the aperture showing the external markings. Nuclear whorls 

 2.2, well rounded, microscopically granulose, forming a small apex. Post- 

 nuclear whorls narrowly shouldered at the summit, inflated, strongly 

 rounded, and marked by closely spaced, rounded axial ribs, which be- 

 come slightly expanded at the summit into minute auricles that crenulate 

 the suture. Of these ribs, 230 are present on the last whorl. They extend 

 rather strongly over the very broadly openly umbilicated base and a little 

 more attenuated over the umbiHcal wall. The spiral sculpture consists of 

 six feeble threads near the summit, which become consecutively less 

 strong from the summit anteriorly. There are 13 spiral threads on the 

 umbihcal wall and the outer portion of the umbilicus. These are strong 

 and well rounded and render their junction with the axial riblets slightly 

 roundly scalloped. Last whorl slightly solute. Aperture very broadly 

 oval; peristome double, the outer narrowly expanded, a little broader at 

 the junction of the basal and inner lip and at the slight auricle at the 

 posterior angle; the inner rather strongly exserted and reflected, coex- 

 tensive but distinct from the outer on the outer lip. The operculum is 

 marked with strong, retractively curved, closely approximated, decidedly 

 elevated lamellae, which become fused to form a pseudolamella at their 

 free border. The first portion does not cover the entire whorl but only 

 a portion thereof; the outer portion shows the lamellae distinct. While 

 the lamellae extend well toward the outer edge of the basal chondroid 

 plate, they become decidedly attenuated and thus give a 3-stage effect, 

 a groove between the whorls, a pseudolamella, and the outer free lamel 

 lated portion. 



The specimen described and figured (U.S.N.M. No. 426043) is a 

 paratype received from Dr. Pilsbry. It comes from Sr. Del Monte's 

 plantation, 5 or 6 miles west of Barahona, Dominican Republic, in a 

 verdant gully near Salvation at about 3,000 feet elevation. 



Subfamily Annulariinae Henderson and Bartsch 



1920. Annularinae Henderson and Bartsch, Proc. U. S. Nat. Mus., vol. 58, 

 p. 71. 



Shell ranging in form from depressed-helicoid to elongate-conic. The 

 axial sculpture may be almost obsolete or it may consist of strong ribs 

 or many slender lamellae, which may or may not be gathered into tufts 

 at the summit. The spiral sculpture may be absent, confined to the um- 

 bilicus, or cover spire and base. In strength the spiral sculpture varies 

 from fine threads to strong cords. Breathing devices are present in some 

 groups and absent in others. They range from a mere notch or slit punc- 

 ture to a pore with external siphon. The operculum may be flat or con- 

 vex on the outside, provided with a calcified lamella, which rises from 

 the inner edge of the whorls. This lamella may be vertically placed upon 



