CUBAN ANNULARIIDAE — ^TORRE AND- BAETSCH 375 



cus, and by 5 weak cords on the umbilical wall. These do not render 

 the axial riblets nodulose. Last whorl adnate. Aperture broadly 

 ovate; peristome double, the inner and outer narrowly expanded 

 and reflected and coextensive, separated only at the posterior angle, 

 where there is a slight depression between the hood forming the outer 

 peristome and the inner. Operculum typically annularid. 



The type, U.S.N.M. No. 535646, was collected at Boca de Yumuri, 

 Oriente Province, by Arango. It has 4.8 whorls and measures: 

 Length, 9.0 mm.; greater diameter, 6.5 mm.; lesser diameter, 5.8 mm. 



ANNULARIA (ANNULARELLA) NIPENSIS, new species 



Plate 52, Figures 7-9 



Shell strongly turbinate, pale yellow. Nuclear whorls almost 2, 

 strongly rounded, smooth, except for the last portion of the last turn, 

 which shows the beginning of the axial riblets. Postnuclear whorls 

 very strongly elevated, strongly rounded, and marked by sublamellar 

 axial riblets, of which 72 occur on the first, 56 on the second, and 64 

 on the last. The sublamellar riblets are slightly expanded at the 

 summit; the spaces between them on the last two whorls are marked 

 by rather strong axial threads, which vary from 2 to 6 in number. The 

 spaces separating these sublamellar axial riblets vary correspondingly 

 in width. Suture scarcely channeled. Base short, inflated, well 

 rounded, openly umbilicated, marked by the continuation of the 

 axial ribs. The umbilical wall is marked by the closely crowded 

 continuation of the axial riblets and by 9 spiral threads, of which the 

 outermost is a little stronger than the rest. Last whorl solute for 

 about one-fourth of a turn. Aperture broadly oval; peristome double, 

 the outer and inner coextensive on the outer and basal lip ; the outer 

 is a little more expanded on the inner and parietal wall, forming an 

 inconspicuous auricle at the posterior angle; at the posterior angle 

 the inner peristome projects as a low shelf. Operculum typically 

 annularid. 



The type, U.S.N.M. No. 356324, was collected by Mr. Henderson 

 at Farallones de Nipe (Sabanilla), Oriente Province. It has 4.5 

 whorls and measures: Length, 12.3 mm.; greater diameter, 11.4 

 mm.; lesser diameter, 8.2 mm. 



ANNULARIA (ANNULARELLA) TANAMENSIS, new species 



Plate 53, Figures 1-3 



?1878. Cistula interstitiale Arango, Contribucion a la fauna malacologica Cu- 



bana, p. 22, in part. 

 ?1890. Cistula interstitiale Crosse, Journ. Conchyl., vol. 38, p. 286, in part. 



Shell turbinate, thin, last whorl semi translucent; the early whorls 

 rose red, the last pale straw colored, a Uttle more yellowish within the 

 aperture. Nuclear whorls almost 2, smooth, well rounded, except 



