CUBAN ANNULARIIDAE — TORRE AND BARTSCH 201 



has a little over 4 whorls remaining and measures: Length, 15.7 mm.; 

 greater diameter, 9.1 mm.; lesser diameter, 6.9 mm. 



Specimens collected by Bartsch at Punta Allegre west of the gypsum 

 mines, on August 25, 1928, enabled him to describe the animal as 

 being pale olivaceous, with the top of the head and the area behind 

 the tentacles a little lighter with a pinkish flush. The entire dorsal 

 part is marked with numerous fine dots. Sides of the body pale 

 olivaceous, with numerous whitish papillae. Tentacles gra}^, with 

 the base the same shade as the body, the extreme tip a little paler. 

 Sole of the foot deeply cleft, of the same shade as the sides. The 

 animal when at rest suspends itself by a mucous thread. 



OPISTHOSIPHON (CUBIT ASIPHONA) CLAUDENS. new species 



Plate 16, Figure 9 



Shell elongate-ovate, white, with interrupted spiral bands of brown. 

 Nuclear whorls decollated in all our specimens. The early postnu- 

 clear whorls are marked by distantly spaced lamellose axial riblets, 

 which show faint indications of feeble nodulations. On the last two 

 turns these nodulations disappear. The axial riblets become more 

 closely spaced and rounded on the early turns, where they are gathered 

 into hollow tufts at the summit at more or less regular intervals. In 

 the type 27 of these ribs are present on the first of the remaming turns 

 and 176 are on the last. Suture strongly constricted. Periphery 

 inflated, strongly rounded. Base short, inflated, strongly rounded, 

 marked by the continuation of the axial ribs and in the exposed por- 

 tion of the umbilicus by 4 slender, spiral threads, which render the 

 axial riblets nodulose. Aperture broadly oval ; peristome double, the 

 inner rather strongly exserted; the outer narrow on the outer and 

 basal lip, wider on the inner lip and parietal wall, forming a moderately 

 strong auricle at the posterior angle of the aperture, marked by con- 

 centric laminae. The outer peristome is notched on the middle of 

 the inner lip, and the portion posterior to the notch is reflected over 

 the umbilicus, which it plugs. All our specimens are dead; we have 

 not seen an operculum but all the other characters are typical of 

 CubitasiphoJia. The siphon is at the posterior angle of the aperture 

 and is reflected backward into the suture. It appears to connect 

 with the hollow axis behind the parietal peristome, and through it with 

 the decollated apex. 



The type, U.S.N.M. No. 355510, was collected by A. Rojas in the 

 Sierra de Judas, Mayajigua, Santa Clara Province. It has 5.5 whorls 

 remaining and measures: Length, 14.0 mm.; greater diameter, 7.1 

 mm.; lesser diameter, 6.1 mm. 



