CUBAN ANNULARIIDAE — TORRE AND BATITSCH 147 



near Ceiba Mocha. This subspecies, like T. (T.) immersa camaro- 

 nensis, has the outer peristome rather strongly fluted, but it differs 

 from camaronensis in having the axial ribs not gathered into series. 



The specimen described and figured, U.S.N. M. No. 535534, was 

 collected at the type locality. It has a little more than 4 whorls 

 remaining, of Avliich the first has 51 axial ribs, the second 88, the third 

 90, and the fourth 86. It measures: Length, 9.2 mm.; greater diam- 

 eter, 4.3 mm.; lesser diameter, 4.0 mm. 



TORRELLA (TORRELLA) IMMERSA GRILLENSIS, new subspecies 



Plate 10, Figure 5 



We have seen this subspecies from Madruga, Finca El Ingles, 

 Sierra del Grillo, and from Sabana de Robles. It is easily distinguished 

 from the other two subspecies by having the fluting of the outer 

 peristome almost absent. 



The type, U.S.N.M. No. 355623, comes from Madruga. It has 

 4.2 whorls remaining, which bear, respectively, 102 axial ribs on the 

 first whorl, 126 on the second, and 130 on the last. It measures: 

 Length, 8.2 mm.; greater diameter, 4.3 mm.; lesser diameter, 3.7 mm. 



Subgenus Torrellisca Henderson and Bartsch 



1920. Torrellisca Henderson and Bartsch, Proc. U. S. Nat. Mus., vol. 58, 

 pp. 69-70. 



Shell elongate-conic, marked only by slender sublamellar axial 

 riblets on the spire. Umbilicus marked by weak spiral cords. Peri- 

 stome expanded but not fimbriated. Breathing siphon a simple tube 

 but slightly bent, opening on the outside. Operculum typically 

 torrellid. 



Type: Torrella (Torrellisca) simpsoni Henderson and Bartsch. 



KEY TO THE SPECIES OF THE SUBGENUS TORRELLISCA 



Inner lip of outer peristome very broadly expanded trinidadensis 



Inner lip of outer peristome not very broadly expanded simpsoni 



TORRELLA (TORRELLISCA) SIMPSONI Henderson and Bartsch 



Shell elongate-conic, wliite. Nuclear whorls decoflated in all our 

 specimens, Postnuclear whorls strongly inflated, well rounded, 

 marked by strongly raised, lamellar, rather distantly spaced axial 

 riblets, which become sHghtly expanded at the summit into slender 

 auricles. The spiral sculpture consists of obsolete threads, which at 

 the most render the riblets slightly wavy. Suture strongly constricted. 

 Periphery well rounded. Base short, well rounded, openly, narrowly 

 umbilicated, marked by the continuation of the axial riblets and by 

 spiral threads, the latter much stronger than those on the spire. 



223580—40 2 



