CUBAN ANNULARIIDAE — TORRE AND BARTSCH 191 



KEY TO THE SUBSPECIES OF OPISTHOSIPHON (BERMUDEZSIPHONA) DETECTUM 



Inner lip of outer peristome slightly inbent in the middle. 



Shell unicolor murinum 



Shell interruptedly spirally banded with brown lucasense 



Inner lip of outer peristome not inbent in the middle detectum 



OPISTHOSIPHON (BERMUDEZSIPHONA) DETECTUM MURINUM, new subspecies 



Plate 14, Figure 8 



This subspecies was collected by Dr. Bermudez on Cayo Ratones, 

 east of Caibarien, Santa Clara Province. It is white or pale yellow 

 and it has the inner lip of the outer peristome slightly flexed and the 

 axial ribs rather conspicuously denticulated. There are no signs 

 of spiral threads in the intercostal spaces. 



The type, U.S.N.M. No. 535464, has 39 axial ribs on the first of the 

 remaining turns and 77 on the last. The type has 3.2 whorls remain- 

 ing and measures: Length, 9.0 mm.; greater diameter, 5.7 mm.; 

 lesser diameter, 4.5 mm. 



OPISTHOSIPHON (BERMUDEZSIPHONA) DETECTUM LUCASENSE, new subspecies 



Plate 14, Figure 7 



This race was collected by Dr. Bermudez on Cayo Lucas, east of 

 Caibarien. It lacks the denticulations of the ribs of 0. (B.) detectum 

 murinum and the ribs are much more closely spaced than in 0. (B.) 

 detectum detectum. It likewise has scarcely any indications of flexing 

 of the inner lip of the outer peristome. 



The type, U.S.N.M. No. 535465, has 22 axial ribs on the first of 

 the remaining turns and 60 upon the last whorl; it has 4.2 whorls 

 remaining and measures: Length, 104 mm.; greater diameter, 6.3 

 mm.; lesser diameter, 5.0 mm. 



OPISTHOSIPHON (BERMUDEZSIPHONA) DETECTUM DETECTUM Torre and Henderson 



Plate 14, Figure 10 



1920. Opisthosiphon {Opisthosiphona) delectus (Torre and Henderson) Henderson 



and Bartsch, Proc. U. S. Nat. Mus., vol. 58, p. 68, nomen nudum. 



1921. Opisthosiphon (Opisthosiphon) detectum Torre and Henderson, Proc. 



U. S. Nat. Mus., vol. 59, pp. 261-262, pi. 42, fig. 1. 



The typical subspecies was collected by Torre at Casimbas de las 

 Llanadas, Sierra de Canoa, Mayajigua, Santa Clara Province. It 

 differs from the other two subspecies in having the axial ribs much 

 more closely spaced, with the denticles at the summit finer. The 

 indication of nodules on the axial ribs occurs only on the early whorls 

 near the summit. There is a slight flexing on the middle of the outer 

 lip. 



The type, U.S.N.M. No. 314960, has 39 axial ribs on the first of 

 the remaining turns and 84 on the last whorl; it has 3.8 whorls remain- 



