CUBAN ANNULARiroAE TORRE AND BARTSCH 333 



stricted. Periphery well rounded. Base short, strongly rounded, 

 openly umbilicated, marked by the continuation of the axial ribs 

 and spiral threads. Within the umbilicus additional spiral threads 

 considerably stronger than those on the outside are present. Aperture 

 almost subcircular; peristome double, the inner moderately exserted 

 and slightly reflected; the outer broadly expanded, somewhat fluted, 

 and denticulated on the free margin. Operculum typically annularid. 

 Three races of this species are before us, all from Oriente Province. 

 The following key and descriptions will help to characterize them: 



KEY TO THE SUBSPECIES OF ANNULARIA (TROSCHELVINDEX) ARANGIANA 



Axial ribs of last whorl very closely spaced arangiana 



Axial ribs of last whorl less closely spaced. 



Outer peristome very strongly fluted cautoensis 



Outer peristome less strongly fluted magistra 



ANNULARIA (TROSCHELVINDEX) ARANGIANA ARANGIANA ([Gundlach] 



Plate 38, Figure 6 



1857. Cycloistoma (Choanopoma) arangianum [Gundlach] Pfeiffer, Malakozool. 



Blatter, vol. 4, p. 177. 

 1920. Anmdaria (AnmUaria) arangiana Henderson and Bartsch, Proc. U. S. 



Nat. Mus., vol. 58, p. 73. 



The typical race comes from near Cabo Cruz, Oriente Province. It 

 is smaller than the other two races here recognized and has the 

 junctions of the axial ribs and spiral threads finer cusped; in that 

 respect, it resembles A. (T.) arangiana magistra. The axial ribs in 

 this form are more closely spaced than they are in ^. (7".) arangiana 

 magistra. 



The specimen described and figured, U.S.N.M. No. 355887, is one 

 of 2 collected by Gundlach at Jiicaronear Cabo Cruz. Ithasahttle 

 more than 4 whorls remaining and measures: Length, 10.0 mm.; 

 greater diameter, 6.5 mm.; lesser diameter, 5.7 mm. 



ANNULARIA (TROSCHELVINDEX) ARANGIANA CAUTOENSIS, new subspecies 



Plate 38, Figure 2 



1878. Choanopoma arangianum Arango, Contribucion a la fauna malacologica 

 Cubana, p. 11, in part. 



This subspecies was collected by Wright at Brazo de Cauto, Oriente 

 Province. It is larger than the typical race, with the axial ribs much 

 more distantly spaced and the junctions of these with the spiral 

 threads less conspicuous. The outer peristome is conspicuously 

 denticulated, particularly so on the outer margin of the inner Hp. 

 The denticles at the summit are also heavier than those of the typical 

 race. 



