CUBAN AXNUL.A.KiroAE- — TORRE AND BARTSCH 185 



uous banding. On the first of the remaining turns in the type there 

 are 47 axial ribs, with 133 on the last whorl. 



The type, U.S.N. M. No. 535455, comes from the paredones 2.5 

 km. from the north entrance to Paso de la Tinaja. It has 4.0 whorls 

 remaining and measures: Length, 13.8 mm.; greater diameter, 10.4 

 mm.; lesser diameter, 8.0 mm, 



OPISTHOSIPHON (BERMUDEZSIPHONA) TORREI Welch 



Plate 14, Figure 4 



1929. Opisthosiphon torrei Welch, Nautilus, vol. 42, p. 98, pi. 5, fig. 3. 

 1934. Opisthosiphon (Opisthosiphon) torrei Welch, Nautilus, vol. 47, p. 131, pi. 

 11, fig. 6. 



Shell elongate-ovate, thin, pale brown with the axial ribs almost 

 white; peristome pale yellow. Nuclear whorls unknown. Post- 

 nuclear whorls strongly rounded, marked by rather distantly spaced, 

 slender, lamellar axial ribs, which are feebly nodulose, the nodules at 

 the summit and those adjacent to the summit being more pronounced 

 than those on the rest of the turn. At the summit the ribs form 

 slender hollow cusps, which extend up against the wall of the preced- 

 ing turn. The intercostal spaces are marked by microscopic hair- 

 lines. Of these ribs, 27 are present on the last turn of the specimen 

 figured. The spaces between the axial ribs are marked by many 

 microscopic threads. Suture well constricted. Periphery inflated, 

 strongly rounded. Base short, inflated, strongly rounded, moder- 

 ately widely umbilicated, and marked in the outer portion of the 

 umbilicus by 2 feeble spiral threads, which render the axial ribs 

 somewhat spinose at their intersection. Aperture very broadly oval; 

 peristome double, the inner exserted and slightly reflected; the outer 

 broadly expanded and marked by strongly elevated concentric lamel- 

 lae. The outer peristome is folded on the middle of the inner lip; 

 posterior to the fold it is reflected over the umbilicus. It is adnate 

 to the preceding turn on the parietal wall. Operculum typically 

 opisthosiphonid. Siphon at the posterior angle of the aperture 

 behind the peristome bent into the suture, evidently communicating 

 with the umbilicus. 



The specimen figured, U.S.N.M. No. 425682, is one of two; it has 

 3.6 whorls remaining and measures: Length, 9.8 mm.; greater diam- 

 eter, 6.3 mm.; lesser diameter, 4.9 mm. It was collected by Drs. 

 Pilsbry and Welch on a hill east of Chambas River, Florencia, Cama- 

 giiey Province. 



OPISTHOSIPHON (BERMUDEZSIPHONA) CAGUANENSE, new species 



Plate 14, Figure 12 



Shell elongate-ovate, ranging from pale yellow to brown, unicolor, 

 or interruptedly spirally banded; the dots composing the bands are 

 usually distantly spaced and are arranged in both axial and spiral 



