202 PROCEEDINGS OF THE NATIONAL MUSEUM Vol.89 



OPISTHOSIPHON (CUBIT ASIPHONA) GUANA JAENSE. new species 



Plate 16, Figure 2 



Shell elongate-ovate, thin, pale brown, marked with interrupted 

 spiral bands of chestnut-brown; aperture flesh colored rayed with 

 brown. The plug at the truncated apex is chestnut-brown. Nuclear 

 whorls decollated in all our specimens. Postnuclear whorls strongly 

 rounded and marked by retractively slanting axial riblets, which are a 

 little more distantly spaced on the first turn than on the succeeding 

 whorls. Here, too, they are rather conspicuously nodulose; the 

 nodules would lead one to believe that this part of the shell possessed 

 spiral sculpture. There are, however, no indications of spiral threads 

 in the intercostal spaces. On the second turn the nodulation becomes 

 much enfeebled and there is only one set of scallops anterior to the 

 summit. This condition is also true of the last turn. These ribs are 

 gathered into rather coarse, conspicuous, hollow tufts at the summit; 

 44 axial ribs are present on the first of the remaining turns, and 120 

 are on the last whorl in the type. Suture not strongly constricted. 

 Periphery inflated, well rounded. Base moderately long, well rounded 

 marked by the continuation of the axial ribs and by 6 spiral threads 

 on the exposed portion of the umbilicus, where they render the axial 

 ribs conspicuously scalloped. Aperture broadly oval; peristome dou- 

 ble, the inner moderately exserted; the outer flaringly expanded, 

 forming a moderately strong auricle at the posterior angle, narrower 

 at the junction of the basal and outer lip, and deeply notched on the 

 middle of the inner lip, the portion posterior to the notch being reflected 

 over the umbilicus, which it plugs. Operculum typically opisthosi- 

 phonid. Siphon at the posterior angle of the aperture directed into 

 the suture, connecting through a channel with the umbilicus, the 

 hollow axis, and the truncated apex of the shell. 



The type, U.S.N.M. No. 535471, was collected by Bartsch in Paso 

 de la Guanaja, Cubitas Mountains, Camagiiey Province. It has 3.5 

 whorls remaining and measures: Length, 11.9 mm.; greater diameter, 

 7.5 mm.; lesser diameter, 5.3 mm. 



OPISTHOSIPHON (CUBIT ASIPHONA) QUINTI. new species 



Plate 16, Figure 10 



Shell elongate-ovate, of flesh-colored or yellowish ground color, 

 marked by interrupted spiral bands of brown. Peristome flesh colored 

 showing the brown bands as rays on the outer peristome. Nuclear 

 whorls 2, small, well rounded, microscopically granulose, forming a 

 truncated conic spire, the outline of which corresponds with the rest 

 of the shell. Postnuclear whorls moderately strongly rounded, marked 

 by numerous, almost vertical or slightly retractively slantmg, sub- 



