CUBAN ANNULARiroAE TORRE AND BARTSCH 143 



Genus TORRELLA Henderson and Bartsch 



1920. TorreUa Henderson and Bartsch, Proc. U. S. Nat. Mus., vol. 58, p. 69. 



Shell elongate-conic, marked by sublameliar axial riblets only on 

 the spire, or by sublameliar axial riblets and by obsolete spiral threads. 

 The umbilicus may be marked by weak or strong spiral cords. Peri- 

 stome double, the outer expanded, simple or fimbriated. Breathing 

 siphons almost straight or decidedly flexed and bent into the umbilicus. 

 Operculum with the ribs occupying only a portion of each whorl and 

 as high as the inner and outer lamellae, which are formed by the 

 fusing of the ribs. 



Type: TorreUa (TorreUa) torreiana ([Gundlach] Arango). 



KEY TO THE SUBGENERA OF TORRELLA 



Siphon bending into the umbiHcus and plugging the hollow axis Torrella 



Siphon not bending into the umbilicus or plugging the hollow axis. _ Torrellisca 



Subgenus Torrella Henderson and Bartsch 

 1920. Torrella Henderson and Bartsch, Proc. U. S. Nat. Mus., vol. 58, p. 69. 



Shell elongate-conic, marked by slender, sublameliar axial ribs and 

 by obsolete spiral cords. The latter render the ribs somewhat sinuous 

 and slightly foliate at their junction. Umbilicus marked by strong 

 spiral cords. Outer peristome expanded and fimbriated at the edge. 

 Breathing siphon strongly flexed and bent into the umbilicus, which 

 it completely closes. Breathing, when the animal is withdrawn, is 

 effected through the hollow axis of the shell and through the decol- 

 lated apex. Operculum typically torrellid. 



Type: TorreUa (TorreUa) torreiana ([Gundlach] Arango), 



KEY TO THE SPECIES OF THE SUBGENUS TORRELLA 



Fimbriations of the outer peristome pronounced. 



Inner lip of outer peristome decidedly fimbriated torreiana 



Inner lip of outer peristome not decidedly fimbriated deficiens 



Fimbriations of outer peristome scarcely indicated immersa 



TORRELLA (TORRELLA) TORREIANA ([Gundlach] Arango) 



Plate 10, Figure 1 



1878. Cienopoma iorreianum [Gundlach] Arango, Contribucion a la fauna mala- 



cologica Cubana, p. 18. 

 1920. Torrella (Torrella) torreiana Henderson and Bartsch, Proc. U. S. Nat. 



Mus., vol. 58, p. 69. 



Shell elongate-conic, milk white. Nuclear whorls decollated in aU 

 our specimens. Postnuclear whorls inflated, strongly rounded, marked 

 by very strongly developed, lamellose, slightty retractively slanting. 



