80 BULLffiTlflSr 181, UNITEO SITATEIS NlATBONlAlL MUSEUM 



which extends in a curve downward and outward to almost meet 

 the next whorl. 



Type: Poteria caymanensis VilshYy — Cyclopilsbrya {Cyclocay- 

 mania) cayTtianensis (Pilsbry). 



KEY TO THE SPECIES OF SUBGENUS CYCLOCAYMANIA 



Shell rugose. 



Umbilicus wide caymanensis 



Umbilicus narrow fonticula 



Shell not rugose laevitesta 



CYCLOPILSBRYA (CYCLOCAYMANIA) CAYMANENSIS (Pilsbry) 



Plate 13, Figures 7-9, 10-12 type 



1930. Poteria caymanensis Pilsbby, Proc. Acad. Nat. Sci. Philadelphia, vol. 82, 

 pi. 18, figs. 4, 5. 



Shell small, depressed-helicoid, flesh colored when the periostracum 

 is removed. Nuclear whorls 1.5, well rounded, smooth. Postnuclear 

 whorls well rounded; the first with axial riblets, the rest with axial 

 riblets which are less regular and toward the end become obsolete 

 and decidedly irregular. On the middle of the postnuclear whorls 

 there are decidedly obliquely retractively slanting rugae, which, com- 

 bined with the axial sculpture, produce a decidedly rough surface. 

 On the last part of the last turn the rugae almost disappear and the 

 whorl, while still rough, is not as conspicuously patterned. Suture 

 well impressed. Aperture rounded. Base openly umbilicated with a 

 very strong carina marking the outer limits of the umbilicus. Within 

 the umbilicus the shell is inpinched above the keel. The surface of 

 the base has the rugations very strongly marked and here they appear 

 quite regular and separated by spaces a little narrower than the 

 raised ridges. The axial threads of growth here also are less pro- 

 nounced, while on the umbilical wall the axial riblets are more em- 

 phasized. Aperture decidedly oblique, somewhat peaked at the pos- 

 terior angle; peristome moderately thickened. The last whorl is 

 slightly descending and the peristome is therefore rendered free. 

 Operculum ? 



Dr. H. A. Pilsbry collected the type and the paratype of this 

 species 1 mile south of Georgetown, Grand Cayman. They constitute 

 Acad. Nat. Sci. Philadelphia No. 150857. The type has 4.5 whorls 

 and measures: Height, 8.7 mm.; greater diameter, 14.0 mm.; lesser 

 diameter, 11.0 mm. The paratype has lost the early whorls. It 

 measures: Height, 10.6 mm.; greater diameter, 16.2 mm.; lesser 

 diameter, 12.8 mm. 



