THE CYCLOPHORID LAND MOLLUSKS OF AMEKIOA 81 



CYCLOPILSBRYA (CYCLOCAYMANIA) FONTICULA (Preston) 

 Plate 13, Figubes 13-18 ; Plate 42, Figuebs 6-7 

 1911. Neocyclotus fonticulus Preston, Proc. Malac. Soc. London, vol. 9, p. 359, fig. 



Shell small, helicoid, covered with a wood-brown periostracuni. 

 Nuclear whorls 1.2, small, well rounded, smooth. Postnuclear whorls 

 strongly rounded, the first turn marked by slender, retractively curved 

 axial riblets. Beyond this the axial riblets give way to semilamellar, 

 more or less closely spaced, irregularly developed, retractively slanting 

 axial elements. These are rendered rough and more or less wavy by 

 retractively curved, broad rugae, which on the last part of the last turn 

 become enfeebled and almost vanish toward the aperture. Suture 

 strongly impressed. Periphery well rounded. Base moderately well 

 rounded, limited at the umbilicus by a very heavy keel. The base is 

 sculptured by the continuation of the fine axial lamellae and by very 

 strong, retractively curved, quite regular and regularly spaced cords, 

 which are separated by grooves a little less wide than the cords. The 

 base is openly umbilicated, the umbilicus being about one-third the 

 width of the greater diameter of the shell. The umbilical wall appears 

 excavated above the bounding keel and is marked by the axial lamella- 

 tion only. In apparently very old, senescent individuals, the last whorl 

 descends near the aperture. In a majority of specimens, however, 

 this is not the case. Aperture decidedly oblique, subcircular. In the 

 specimens where the last whorl is adnate to the preceding turn, the 

 attachment to the parietal wall terminates in a lunate line and the 

 peristome is protracted into a decided point at the posterior angle. In 

 specimens where the last whorl is descending, the aperture becomes 

 more nearly circular and the posterior angle shows a carina on the 

 outside. Peristome simple ; the outer lip thin ; the inner lip, however, 

 is materially thickened. Operculum typically cyclocaymanid. 



Preston's type shows the senescent state, and I am figuring two speci- 

 mens, one corresponding to his figure, and another showing the more 

 prevalent phase. These have 4.9 and 4.8 whorls, respectively, and 

 measure : Height, 10.0, 9.1 mm. ; greater diameter, 14.5, 14.6 mm. ; lesser 

 diameter, 11.5 and 11.0 mm., respectively. 



These were selected from a large series of specimens, U.S.N.M. No. 

 466831, collected by T, Savage English on Grand Cayman Island, with- 

 out specific locality. 



Dr. H. A. Pilsbry obtained this species in the woods southwest of 

 North Sound, and I found a dead specimen, U.S.N.M. No. 392278, at 

 the church between St. George and Bowdentown. 



