108 BULLETES" 181, UNITE© STATES NIATT0!N1AIL MUSDETJM 



The type of this species, the only specimen known, was collected by 

 Dr. H. B. Baker at Somerset, Manchester Parish, Jamaica, and bears 

 the Philadelphia Academy of Natural Sciences catalog number 174145. 

 It has 5.2 whorls and measures : Height, 17.8 mm. ; greater diameter, 

 27.0 mm. ; lesser diameter, 20.0 mm. 



This is by far the most roughly corrugated species of the Jamaican 

 Poterias, having the largest and most distantly spaced wrinkles of all. 



POTERIA (POTERIA) IMITATOR, new species 



Plate 16, Figubes 10-12 



Shell of medium size, unicolor or more frequently banded with a 

 broad zone of dark chestnut brown above and below the periphery, 

 the posterior half, the band at the periphery, and the base being 

 brownish yellow. The nucleus consists of a single whorl, which is 

 very small, almost flattened, and moderately well rounded. The first 

 postnuclear turn is marked by fine, decidedly retractively curved axial 

 riblets, which are about as wide as the spaces that separate them. 

 These riblets on the next turn become much increased in size. They 

 are low, well rounded, and almost as wide as the spaces that separate 

 them. On the succeeding turn the axial riblets are lost sight of by 

 their conspicuous wrinkling and pitting. The wrinkles here branch 

 and anastomose and form an irregular network of meshes enclosing 

 well-impressed pits, which may be circular or elongate. The summit 

 of the turns is decidely nodulose on the last whorl. On the early post- 

 nuclear whorls the suture is well impressed. Periphery well rounded 

 and marked by the pitting described for the spire. Base well rounded, 

 broadly openly umbilicated with a decidedly elevated, almost lamellar 

 keel marking the outer edge of the umbilicus. This keel is rendered 

 rough by the incremental lines. The anterior third of the base between 

 the periphery and the umbilical keel, that is the portion usually 

 covered by a brown band, is smooth ; the rest of the base is wrinkled 

 like the spire, but here the wrinkles are finer and the pits enclosed 

 between them a little deeper. The umbilical wall bears regular axial 

 riblets and fine lines of growth. Aperture subcircular, somewhat 

 oblique, decidedly protracted into an angle at the posterior angle and 

 thickened at the umbilical keel; the outer lip of the peristome is 

 thin, and the inner somewhat thickened. The operculum is typically 

 poterid. 



The type, U.S.N.M. No. 535975, was collected by C. R. Orcutt at 

 Bogue Hill, St. Elizabeth Parish, Jamaica. It has 4,8 whorls and 

 measures: Height, 16.9 mm.; greater diameter, 23.6 mm.; lesser 

 diameter, 17.8 mm. 



This species occupies the northern part of St. Elizabeth Parish 

 and the adjacent areas of Manchester Parish. 



