CUBAN ANNULAEiroAE TORRE AND BARTSCH 189 



dark bluish gray, almost black. There are numerous fine dots and 

 streaks on the forehead and dorsum. Sides of the body dark smoky 

 gray with oUvaceous suffusion. The numerous flattened papillae 

 are marked by many fine white dots. Sole of the foot smoke gray, 

 deeply medially cleft. Motion direct. The animal suspends by a 

 mucous tliread when at rest. 



OPISTHOSIPHON (BERMUDEZSIPHONA) AGUILERIANUM (Arango) 



Shell very elongate-ovate, straw colored, with or without faint 

 interrupted spiral bands of bro\vn. Nuclear whorls 2, inflated, strongly 

 rounded, microscopically granulose, forming an apex that is in perfect 

 continuation of the rest of the spire. Postnuclear whorls rather high 

 between summit and suture, well rounded, marked by slender sub- 

 lamellar axial ribs, which form hollow cusps at the summit. The 

 intercostal spaces are marked by microscopic axial hairlines. Suture 

 well impressed. Periphery inflated, strongly rounded. Base rather 

 long, well rounded, and marked by the continuation of the axial 

 ribs, wliich extend into the moderately broadly open umbilicus, and 

 by several spiral threads in the umbilicus, which render the axial 

 riblets scalloped at their junction. Aperture broadly oval; peristome 

 double, the inner somewhat exserted, slightly reflected; the outer 

 broadly expanded, a httle narrower on the basal lip than on the rest, 

 neither notched nor inbent on the inner lip, marked by slender con- 

 centric lamellae. Operculum typically opisthosiphonid. Siphon at 

 the posterior angle of the aperture bent backward into the suture. 



This species, as far as known, is restricted to Oriente Province. 

 We are recognizing two subspecies, which the following key and 

 descriptions will help to differentiate. 



KEY TO THE SUBSPECIES OF OPISTHOSIPHON (BERMUDEZSIPHONA) AGUILERIANUM 



Hollow cusps at the summit very strongly developed aguilerianum. 



Hollow cusps at the summit weakly developed holgiiinense 



opisthosiphon (bermudezsiphona) aguilerianum aguilerianum (arango) 



Plate 14, Figure 9 



1876. Cydostoma aguilerianum Arango, An. Acad. Cienc. Med., Fis. Nat. 



Habana,vol. 12, p. 280. 

 1878. Tudora ? aguileriana Arango, Contribucion a la fauna malacologica Cubana, 



p. 21. 

 1932. Opisthosiphon aguilerianum Aguayo, Nautilus, vol. 45, pp. 92-93. 



The typical subspecies was originally described by Arango with 

 no more specific locality than that it was collected in Cuba by Wright. 

 This race was lost for a long time. It was rediscovered by Torre at 

 Gibara. We are figuring Arango's type, U.S.N.M. No. 535461, and a 

 complete specimen of Torre's collecting. 



