THE CYCrLOPHORI'D LAND MOLLUSIKS OF AMERICA 123 



The specimen figured, U.S.N.M. No. 535980, is one of the Adams 

 collection labeled ''jarruiicense Sowerby." It has 4.5 whorls and 

 measures : Height, 15 mm. ; greater diameter, 20.8 mm. ; lesser diam- 

 eter, 16 mm. 



Chitty's notatior came from St. Elizabeth Parish, Jamaica. Our 

 specimen appears to agree with Chitty's diagnosis. 



POTERIA (CYCLOBAKERIA) YALLAHSENSIS, new species 



Plate 17, FiGtfBES 16-18 



1857. Cyclotus notatior var. a Chitty, Proc. Zool. Soc. London, vol. 25, p. 148. 



Shell very small, elevated helicoid, wood brown, with the nucleus 

 pale buff, the succeeding turn pale chestnut-brown and the rest 

 wood brown. The nucleus consists of a single well-rounded, smooth 

 turn ; the succeeding turns are marked by feeble, slightly retractively 

 curved, closely spaced hairlines, those of the last whorl being a little 

 stronger. Beginning with the last whorl, feeble nodulose cords make 

 their appearance. These cords are more or less protractively curved 

 but irregularly developed so as to produce a zigzag effect. Suture 

 well impressed, except on the last whorl, which is appressed to the 

 preceding whorl. Periphery well rounded, marked by the feeble 

 continuation of the sculpture of the spire. Base inflated, strongly 

 rounded, narrowly umbilicated, with a weak cord marking the outer 

 edge of the umbilicus. The base is marked by lines of growth and 

 a few indications of spiral threads. The umbilical wall is marked 

 by strong, closely spaced incremental lines. Aperture decidedly 

 oblique, protracted at the posterior angle to form an angle ; peristome 

 rather thin. Operculum typically cyclobakerid. 



The type, U.S.N.M. No. 356093, comes from Yallahs River, St. 

 Thomas Parish, Jamaica. It has 4.9 whorls and measures : Height, 

 11.0 mm. ; greater diameter, 15.0 mm. ; lesser diameter, 11.3 mm. Dr. 

 AVelch also collected a large series at White Horses, St. Andrew 

 Parish. 



This species can readily be distinguished from P. (C.) notatior 

 (Chitty) by the absence of the depressed area below the summit. 



POTERIA (CYCLOBAKERIA) BALNEARIS, new species 



Plate 17, Figuees 7-9 



Shell small, depressed-helicoid, covered with a dark wood-brown 

 periostracum. The nucleus consists of a single well-rounded, smooth 

 turn. The postnuclear whorls are well rounded and marked by 

 retractively curved hairlike axial riblets. The last whorl also has 

 feeble zigzag axial riblets, which do not come quite to the summit. 



