ART. 6 A NEW WEST INDIAN MOLLUSK FAUNULA BARTSCH 7 



CEPOLIS LINCOLNI, new species 



Plate 3, Figuees 10, 11, 12 



Shell helicoid; the early whorls pale horn-colored, the later ones 

 flesh-colored with a broad chestnut-brown band at the summit and 

 another one immediately above the periphery, while a third band 

 is about as far superior to the periphery as the last mentioned is 

 posterior to it; in other words, these two bands are separated by a 

 light zone as wide as that separating the band at the summit from 

 the median band. The rest of the base and the peristome are flesh- 

 colored. Nuclear whorls 1.5, low, well rounded, marked by fine 

 incremental lines and microscopic granulations only. Postnuclear 

 whorls 3.5, well rounded, marked by strong retractively curved axial 

 threads, which are rather distantly spaced, the spaces that separate 

 them being fully four times as wide as the riblets. Behind the 

 aperture these riblets become even stronger than on the rest of the 

 whorls. They are also present on the base, although here they are 

 slightly reduced. The last whorl descends considerably below the 

 periphery at the aperture. Periphery obsoletely angulated. Base 

 short, well rounded, and narrowly umbilicated, the umbilicus cov- 

 ered for three-fourths of its width by the reflected inner lip. There 

 is a deep pit a little distance behind the aperture, slightly below the 

 periphery, which it parallels and which corresponds to an internal 

 fold that half closes the aperture. Another pit is hidden by the 

 columella and this forms a basal tooth on tlie middle of the basal lip. 

 The aperture is oval; the peristome is somewhat expanded, reflected, 

 and thickened; the parietal wall is covered by a thick callus, which 

 unites the posterior angle of the aperture with the columella; the 

 left outline of this callus is sigmoid. 



Ty^e.—T\\% type, U.S.N.M. No. 403909, measures : Height, 13 mm ; 

 greater diameter, 19.7 mm ; lesser diameter, 16.2 mm. 



Re7narks. — U.S.N.M. No. 403898 contains 24 additional specimens. 



This species is related to Cepolis trizonella Pilsbry, but differs from 

 it as well as from Cepolis trizonalis Grateloup in being decidedly 

 more conic and in having the last whorl decidedly more inflated and 

 the sculpture stronger in every way. 



CEPOLIS TRIZONALIS BEATENSIS, new subspecies 



Plate 3, Figures 1, 2, 3 



Early whorls pale buff, the later ones flesh-colored with a zone of 

 chestnut-brown separated from the summit by a light area equaling 

 this band in width. A second brown band a little wider than the 

 one near the summit encircles the turns a little anterior to the pe- 

 riphery, the space betweeen the two dark bands being a little wider. 



