286 PROCEEDINGS OF THE NATIONAL MUSEUM Vol.89 



curved axial riblets, which are a Httle more distantly spaced on the 

 early turns than on the last, where they are rather closely crowded ; the 

 spaces separating them on the last whorl are only a trifle wider than 

 the riblets; these riblets may become expanded at the summit or 2, 

 3, or even more, may become fused to form small hollow cusps. Of 

 these riblets, 54 are present on the first postnuclear whorl and 112 are 

 present on the last whorl. Suture strongly constricted. Periphery 

 inflated, strongly rounded. Base short, inflated, strongly rounded, 

 marked by the continuation of the axial ribs, which extend into the 

 open umbilicus, and by 12 spiral threads on the umbilical wall, which 

 render the axial ribs nodulose at their intersection. The last whorl is 

 solute for about one-tenth of a turn behind the peristome. Aperture 

 almost circular; peristome double, the inner strongly exserted, par- 

 ticularly so on the outer Up, slightly slit at the posterior angle; the 

 outer broadly expanded on the inner lip and the parietal wall, and 

 adnate to the preceding turn at the parietal wall, narrow on the outer 

 and basal Up, forming a moderately strong auricle at the posterior 

 angle, which is marked by the concentric laminae. Operculum typi- 

 cally annularid. Siphon at the posterior angle of the aperture bent 

 backward and opening there into the suture. 



The type, U.S.N.M. No. 535622, was collected by Bermudez at 

 Loma La Cantarilla, about 3 miles west of Guaracabulla, Santa Clara 

 Province. It is a complete specimen having 5.8 whorls and measures. 

 Length, 13.0 mm.; greater diameter, 7.6 mm.; lesser diameter, 6.0 mm. 



ANNULARIA (ANNULARODES) INDIVISA (Welch) 



Plate 29, Figure 3 



1929. Choanopoma uncinatum indivisum Welch, Nautilus, vol. 42, p. 98, pi. 5, 



fig. 7. 

 1934. Choanopoma (Annularodes) uncinatum indivisum Welch, Nautilus, vol. 47, 



p. 133, pi. 11, fig. 8. 



Shell elongate-conic, pale wax color, or darker, with interrupted 

 spiral bands of brown, of which 3 are present between summit and 

 suture and 3 are on the base. The spiral bands show conspicuously on 

 the inside of the outer lip. Nuclear whorls almost 2, inflated, well 

 rounded, microscopically granulose, with the last portion of the last 

 turn showing the beginning of the postnuclear sculpture. Postnuclear 

 whorls shghtly inflated, strongly rounded, and marked by rather 

 distantly spaced, slender, retractively slanting axial riblets, which 

 either individually or by fusion of two adjacent ribs form conspicuous 

 hollow cusps at the summit. Of these ribs 50 are present on the first, 

 86 on the second, 122 on the third, and 126 on the last of the remaining 

 turns. Suture strongly constricted. Periphery well rounded. Base 

 moderately long, well rounded, openly umbilicated, and marked by 

 the continuation of the axial riblets and by fine spiral threads on the 



