CUBAN ANNUDARIIDAE — TORRE AND BARTSCH 241 



The last whorl is usually solute. The peristome is double, the outer 

 expanded but not thickened. Operculum typically adamsiellid with 

 fine hairlike extensions on the outside of the chondroid basal plate 

 radiating from the raised lamella anteriorly. 



Type: Adamsiella (Cubadamsiella) gratiosa, new species. 



The sublamellar axial ribs and tliin outer peristome readily dis- 

 tinguish this subgenus from the Jamaican Adamsiellops. 



Typical Adamsiella is not found in Cuba. So far we have found 

 only the present subgenus in the island, 



KEY TO THE SPECIES OF THE SUBGENUS CUBADAMSIELLA 



Shell elongate-ovate gratiosa 



Shell elongate-conic. 



Axial ribs scalloped leoni 



Axial ribs not scalloped procax 



ADAMSIELLA (CUBADAMSIELLA) GKATIOSA. new speciea 



Plate 21, Figure 4 



Shell elongate-ovate, varying in color from wax yellow to pale 

 orange. Nuclear whorls a little more than 1.5, well rounded, and 

 marked by microscopic granules. Postnuclear whorls inflated, 

 strongly rounded, marked by very slender, rather distantly spaced, 

 sublamellar axial riblets. The broad intercostal spaces and the sides 

 of the ribs are marked in addition by exceedingly fine, microscopic, 

 wavy incremental lines. There are about 40 of these riblets on the 

 first whorl and about 55 on the last. The spiral sculpture is absent 

 on the spire. Suture strongly constricted. Periphery inflated, 

 strongly rounded. Base short, stronglj^ rounded, openly umbili- 

 cated, and marked at the umbilical edge by a feebly developed spiral 

 thread. There are also some faint indications of another thread 

 a little farther within. The last whorl may be solute or adnate to 

 the preceding turn. The outside of the parietal wall is marked with 

 the continuation of the axial ribs. Aperture very broadly oval, 

 almost circular; peristome double, the outer thin, expanded, a little 

 narrower on the parietal wall, slightly auriculate at the posterior 

 angle; the inner slightly exserted and slightly reflected. Operculum 

 with an almost central nucleus and a strongly elevated lamella rising 

 from the inner edge of the turns, which is slightly outcurved at the 

 free edge. The spaces between the lamellae are marked by fine 

 granules. In some of these specimens there is a slight indication of 

 distantly spaced, slender, recurved threads between the lamellae. 



The type, U.S.N. M. No. 535339, was collected by Bartsch at 

 Guajabana, Santa Clara Province, on the western end of the hill 

 north of the railroad track. It has 6.4 whorls and measures: Length. 

 7.0 mm.; greater diameter, 3.9 mm.; lesser diameter, 3.4 mm. 



