374 PROCEEDINGS OF THE NATIONAL, MUSEUM Vol.89 



Shell depressed-helicoid, thin, straw yellow, a little paler on the 

 peristome. Nuclear whorls strongly rounded, smooth except for 

 the last portion of the last turn, which shows the beginning of the 

 postnuclear sculpture. Postnuclear whorls strongly inflated, rather 

 depressed, marked by retractively slanting, sublamellar axial riblets, 

 of which 98 occur on the last two whorls. These riblets are slightly 

 expanded into cusps at the summit. Between these distantly spaced 

 sublamellar riblets are finer axial threads, which vary in number 

 from 1 to 7; the spaces between them also vary correspondingly in 

 width. Suture narrowly strongly channeled. Periphery well round- 

 ed. Base short, strongly roimded, openly unibilicated, marked by 

 the continuation of the axial riblets and by 2 slender spiral threads 

 adjacent to the umbilicus. The axial riblets continue into the um- 

 bilicus and here become a little enfeebled and closely spaced, main- 

 taining their arrangement of strong and feeble elements. In addition 

 to the axial riblets there are 7 spiral threads on the umbilical wall, 

 which are of almost equal strength and spacing. Aperture almost 

 circular; peristome double, the inner slightly expanded, reflected 

 over and adnate to the outer, scarcely distinct on the basal and 

 outer lip, but well marked at the posterior angle and on the inner 

 lip; the outer broadly expanded, forming a conspicuous auricle at the 

 posterior angle, which is adnate to the preceding turn. Operculum 

 typically annularid. 



The type, U.S.N.M. No. 356303, was collected by Mr. Henderson 

 near Holguin, Oriente Province. It has 3.5 whorls and measures: 

 Length, 8.0 mm.; greater diameter, 10.9 mm.; lesser diameter, 9.0 mm. 



We believe that it is the same shell which the authors, whom we 

 quote in our synonymy, refer to as having been collected between 

 Holguin and Barajagua. 



ANNULARIA (ANNULARELLA) YUMURIENSIS. new species 



Plate 52, Figures 4-6 



Shell small, of turbinate outline, flesh colored. Nuclear whorls 2, 

 well rounded, microscopically granulose. Postnuclear whorls some- 

 what inflated, strongly rounded, and marked on the first whorl by 

 rather strong axial riblets and thereafter by axial ribs of two series, 

 namely, strong sublamellar elements, between which fine, threadlike 

 riblets are present. Of the strong axial ribs 59 are present on the 

 first turn, 55 on the second, and 59 on the last. The intercalated 

 riblets vary in number from 3 to 7. The strong axial ribs are not 

 developed into cusps at the summit, but appear to maintain equal 

 strength throughout. Suture slightly channeled. Periphery well 

 rounded. Base short, inflated, strongly rounded, marked by the 

 continuation of the axial ribs only. Base narrowly, openly umbili- 

 cated, marked by a strong cord at the outer termination of the umbili- 



