114 BULLETIN 181, UTS^TEO STATES NATIOiNlAL IMUSIEXJM 



last turn. Suture well impressed on all the whorls except the last 

 part of the last whorl, which is appressed at the summit. Pe- 

 riphery well rounded. Base strongly rounded, openly umbilicated, 

 with an obsolete cord at the outer edge of the umbilicus, marked 

 by the weak continuation of the axial riblets, which also extend over 

 the umbilical wall. Aperture subcircular, decidedly protracted at 

 the posterior angle into an angle; outer lip of the peristome thin, 

 the inner lip somewhat thickened. Operculum typically poterid. 



We have figured Adams' type, which is in the collection at Am- 

 herst College. It has 5 whorls and measures: Height, 14.0 mm.; 

 greater diameter, 19.0 mm. ; lesser diameter, 14.9 mm., and is said to 

 come from the interior of Manchester Parish, Jamaica. 



The specimen resembles P. (P.) plana but is easily distinguished 

 from that by the absence of flattening at the summit. 



POTERIA (POTERIA) NODOSA (Chitty) 



1857. Cyclotus nodosus Chitty, Proc. Zool. Soc. London, vol. 25, p. 157. 

 1898. Neocyclotus {Plectocyclotus) nodosus Kobext and Mollendobff, Nachrb. 

 deutschen malak. Ges., vol. 29, p. 138, reprint. 



I have not seen specimens referable to this species, so quote 

 Chitty's description. He says that it came from Maroon Town, St. 

 James Parish, Jamaica. 



"/^orm, more depressed-conic. Colour, white, with light brown 

 epidermis, brown at lip and on operculum. Sculpture, lines of 

 growth, remarkably knotted corrugation on last whorl, pitted deep 

 about umbilical keel, and coarse lines of growth within. Spire, 

 depressed with rather straight outlines. Whorls, 5%, well rounded, 

 with deep suture. Aperture, rather oblique to the left below. Peri- 

 treme, slightly sinuate above. Umhilicus, wide, greatest breadth 0.3 

 [7.5 mm.], funnel-shaped. Umhilical heel, not wide, but well pro- 

 duced. Operculwn, small, strong, sharp-edged lamina of 5 or 6 

 wide-apart whorls, rising almost equally from the flat plane, end 

 of last thickened. Height 0.6 [15 mm.], greatest breadth 0.85 [21.25 

 mm.], least breadth 0.67 [16.75 mm.]." 



This appears nearest to P. (P.) corrugatissima (Chitty), which 

 occupies a range much to the south. 



POTERIA (POTERIA) NOTATA (Chitty) 



1857. Cyclotus notatus Chitty, Proc. Zool. Soc. London, vol. 25, p. 148. 

 1898. Neocyclotus (Plectocyclotus) notatus Kobelt and Mollendobtf, Nachrb. 

 deutschen malak. Ges., vol. 29, p. 138, reprint. 



I have not seen specimens referable to this species, so quote Chitty's 

 description. He says it came from Trelawny, Jamaica. 



'•^Sculpture, fine and almost smooth, with a slight corrugation on 

 the upper part of latter half of the last whorl, which is devoid of 



