332 PROCEEDINGS OF THE NATIONAL MUSEUM Vol.89 



1863. Chondropoma incuUvm Reeve, Conchologia iconica, No. 63. 

 1920. Annularia (Annularia) inculta Henderson and Bartsch, Proc. U. S. 

 Nat. Mus., vol. 58, p. 73. 



Shell cylindro-conic, pale buffi^ marked by interrupted spiral bands 

 of brown; peristome unicolor. Nuclear whorls 1.7, strongly rounded, 

 the first one and one-fourth smooth, the rest showing the beginning of 

 the postnuclear sculpture. Postnuclear whorls inflated, strongly 

 rounded, marked by closely spaced, rather broad, poorly developed, 

 retractively slanting axial riblets, of which 92 occur on the first 

 turn, 106 on the second, 120 on the third, and 90 on the last. On 

 the last turn they are very much enfeebled, broadened and irregular, 

 and almost obsolete. Two, 3, or even more of the riblets become 

 fused at the summit to form conspicuous denticles. The spiral 

 sculpture consists of rather broad, low, poorly developed threads, 

 of which 9 occur on the first turn, 11 on the second, and 13 on the thhd, 

 while on the last they are too poorly developed to be counted. The 

 junction of the axial ribs and spiral threads scarcely forms nodules on 

 the early whorls. The spaces enclosed between them are either mere 

 lines or they are narrow rectangular pits having their long axis parallel 

 with the axial sculpture. Suture moderately constricted. Periphery 

 inflated, well rounded. Base moderately long, narrowly, openly 

 umbilicated, marked by the feeble continuation of the axial riblets 

 and by 9 almost obsolete spiral threads, while within the umbilicus 

 10 additional feeble spiral threads are present. The last whorl is 

 solute for about one-fifth of a turn. Aperture very broadly oval; 

 peristome double, the inner scarcely at all exserted but strongly 

 reflected and adnate to the outer almost entirely, except at the pos- 

 terior angle; the outer only narrowly expanded, forming a feeble 

 auricle at the summit. 



The specimen described and figured, U.S.N.M. No. 535550, is one 

 of a series collected at La Vigia, Trinidad, Santa Clara Province. 

 It has a little over 4 whorls and measures: Length, 15.5 mm.; greater 

 diameter, 7.9 mm.; lesser diameter, 6.5 mm. 



ANNULARIA (TROSCHELVINDEX) ARANGIANA ([Gundlach] Pfeiffer) 



Shell broadly elongate-conic, pale buff, variously spotted with inter- 

 rupted spiral bands of brown; the dots composing these bands are not 

 exactly arranged in axial and spiral series; peristome rayed. Nuclear 

 whorls decollated in all our specimens. Postnuclear whorls strongly 

 rounded, marked by slender, retractively curved axial riblets, which 

 may become expanded at the summit into hollow cusps, or sometimes 

 two or more may fuse to form such a cusp. The spiral sculpture 

 consists of slender threads, which render the axial ribs tubcrculated, 

 while the spaces enclosed between the axial ribs and the spiral threads 

 are more or less square or rectangular areas. Suture strongly con- 



