CUBAN ANNULAEIIDAE TORRE AND BARTSCH 137 



OPISTHOCOELICUM (OPISTHOCOELEX) SIMULANS, new species 



Plate 9, Figure 4 



Shell elongate-ovate, of pale orange color, with the nuclear whorls 

 and peristome paler. Nuclear whorls 2, very strongly inflated and 

 verj'' strongly rounded, separated by a very deep suture; smooth, 

 except for microscopic granulations. Postnuclear whorls inflated, 

 strongly rounded, and marked by very strong, rather distantly spaced, 

 lamellar axial ribs, which are rendered slightly scalloped on the early 

 whorls and obsoletely nodulose on the last turn. These axial lamellar 

 ribs extend strongly from the summit to the umbilical area. At the 

 summit of the turns they interlock somewhat with the lamellae of the 

 preceding turn. In addition to these strong axial lamellae, of which 

 25 occur upon the last whorl, the whorls are marked by an occasional 

 mtercalated finer axial cord and by numerous exceedingly fine, 

 microscopic, somewhat wavy axial lirations. Suture very strongly 

 constricted. Periphery inflated, strongly rounded. Base short, 

 strongly rounded, and marked by the same axial sculpture that 

 characterizes the spire, which extends into the umbilicus. The 

 umbilicus is bordered by a spiral cord, with a second cord on the 

 umbilical wall halfway between this and the reflected caUus. Peri- 

 stome double, the outer broadly expanded on the posterior portion of 

 the outer lip and the parietal wall, forming a somewhat backward- 

 turned auricle at the posterior angle, narrower on the basal and 

 columellar walls. On the columellar wall the outer lip is reflected 

 backward over the umbilicus and on the parietal wall it extends across 

 a large gap covering the umbilical area and it is pinched in at the 

 outer edge of the mnbilicus. The outer peristome is marked by a 

 series of wavy, concentric lamellae; the inner peristome is slightly 

 exserted. There is a puncture in the parietal wall near the posterior 

 angle, which communicates with the short, backward-turned siphon 

 immediately behind the outer lip. The operculum is too large to be 

 withdra\vn within the aperture. The lamellae of the early turns are 

 distinct as in Parachondria, but they cover the entire whorl. On the 

 last turn these lamellae become fused to form a solid plate, marked 

 by the indications of the lamellae. 



The type, U.S.N.M. No. 535343, was collected by Bartsch at Finca 

 Los Cangilones at the foothills of the Cubitas Mountains, Camagiiey 

 Province. It has 3.5 whorls remaining and measures: Length, 9.2 

 mm.; greater diameter, 5.9 mm.; lesser diameter, 5.0 mm. 



He found this species also on the paredones on the east side of the 

 Vereda de Los Burros, 1.5 km. north of Fmca San Clemente, Cubitas 

 Mountains. 



