CUBAN ANNULARIIDAE — TORRE AND BARTSCH 175 



preceding turn. Operculum typically opisthosiphonid. The siphon 

 at the posterior angle of the aperture behind the outer peristome is 

 reflected into the suture, communicating with the channel behind the 

 parietal wall, connecting with the hollow axis and the decollated tip. 



The type, U.S.N.M. No. 535446, was collected by Bermudez at 

 Cambao, Yaguajay, Santa Clara Province. It has 3.7 whorls remain- 

 ing and measures: Length, 12.0 mm.; greater diameter, 6.9 mm.; 

 lesser diameter, 5.7 mm. 



We have seen specimens also collected by Bermudez at Vereda 

 del Eesbalillo, Yaguajay and at Vereda El Guajaco, Cambao, Yagua- 

 jay, Santa Clara Province. 



OPISTHOSIPHON (BERMUDEZSIPHONA) BANAOENSE Torre and Henderson 



Shell varying from ovate to broadly ovate and ranging in color 

 from white to flesh color to pale yellow to orange and brown to unicolor 

 or with a band of dark brown at the periphery. Nuclear whorls 2, 

 small, inflated, strongly rounded, microscopically granulose. Postnu- 

 clear whorls inflated, strongly rounded, and marked by numerous 

 closely spaced, almost vertical axial ribs, which are stronger and more 

 distantly spaced on the early turns than on the later. These ribs 

 develop at more or less regular intervals into hollow cusps at the 

 summit, which are also of varying size, suture well constricted. Per- 

 iphery inflated, strongly rounded. Base short, strongly rounded, and 

 marked by the continuation of the axial ribs, which extend undi- 

 minished into the umbilicus. The exposed portion of the umbilicus 

 shows several spiral threads, which render the axial riblets scalloped 

 at their junctions. Aperture broadly ovate; peristome double, the 

 inner moderately exserted on the inner lip and reflected over and 

 appressed to the outer peristome of the outer lip. The outer peristome 

 is narrowly expanded on the outer and basal lip, and broadly ex- 

 panded to form an auricle at the posterior angle. On the inner lip 

 the outer peristome is also expanded and deeply notched; the broad 

 flap posterior to the notch is reflected over and plugs the umbilicus, 

 while on the parietal wall it is adnate to the preceding turn. The 

 outer peristome is marked by fine concentric lamellae. Operculum 

 typically opisthosiphonid. Siphon at the posterior angle of the aper- 

 ture bends into the suture, connecting with the hollow axis through 

 a channel behind the outer peristome of the parietal wall. 



This species appears to be confined to the southwestern portion 

 of the Cubitas Mountain region. We are recognizing two subspecies, 

 which the following key and descriptions will help to distinguish: 



KEY TO THE SUBSPECIES OF OPISTHOSIPHON (BERMUDEZSIPHONA) BANAOENSE 



Shell broadly ovate banaoense 



Shell ovate trincherasense 



