148 PROCEEDINGS OF THE NATIONAL MUSEUM Vol.89 



Last whorl solute for almost half a turn. Aperture very broadly oval; 

 peristome double, the imier slightly exserted; the outer rendered 

 irregular at the posterior angle by the breatliing siphon, narrowly 

 expanded, usually fluted at the junction of the inner and basal lip, 

 and marked by concentric laminae. Operculum typical of Torrella. 

 The breathing siphon consists of a curved, short tube, wliich has its 

 origin immediately behind the peristome at the posterior angle of the 

 aperture, and which is open at the inbent terminal. 



This species appears to be confined to Santa Clara Province, where 

 two subspecies are present. These can be distmguished readily by 

 the following key and descriptions: 



KEY TO THE SUBSPECIES OF TORRELLA (TORRELLISCA) SIMPSONI 



Axial ribs distantly spaced temeroensls 



Axial ribs not distantly spaced simpsoni 



TORRELLA (TORRELLISCA) SIMPSONI TERNEROENSIS, new subspecies 



Plate 10, Figure 7 



Tliis race was collected by Henderson at Loma del Ternero, 6 or 8 

 miles north of Manicaragua, Santa Clara Province. He collected it 

 also at Hoyo de Manicaragua. It is distinguished readily from 

 typical T. (T.) simpsoni simpsoni by having the axial ribs much more 

 distantly spaced. 



The type, U.S.N.M. No. 355540, has 3.8 whorls remaining, of which 

 the first and second have 32 and the last 43 axial ribs. It measures: 

 Length, 6.5 mm.; greater diameter, 3.5 mm.; lesser diameter, 3.0 mm. 



TORRELLA (TORRELLISCA) SIMPSONI SIMPSONI Henderson and Bartsch 



Plate 10. Figure 6 



1920. Torrella (Torrellisca) simpsoni Henderson and Bartsch, Proc. U. S. 

 Nat. Mus., vol. 58, pp. 80-81. 



This subspecies comes from the Soledad plantation, near Cienfuegos, 

 Santa Clara Province. It is distinguished readily from T. (T.) 

 simpsoni terneroensis by the fact that the axial ribs are much more 

 closely spaced. 



The type, U.S.N.M. No. 314942, has a little more than 4 whorls 

 remaining, of which the first bears 46 axial riblets, the second 60, 

 the third 82, and the last 100, The type measures: Length, 7.4 mm.; 

 greater diameter. 3.7 mm.; lesser diameter, 3.3 mm. 



TORRELLA (TORRELLISCA) TRINIDADENSIS. new species 



Plate 10, Figure 8 



SheU elongate-conic, flesh colored. Nuclear whorls decollated in 

 all our specimens. Postnuclear whorls strongly rounded and crossed 



