POTAMIDES. 



Genus POTAMIDES, Bronguiarl. 



Testa subJlnviatiUs, daviformis, pyramidiilk, inrrila ,■ an- 

 frnctihus numerom, aiigulatk ; aperturd subquadratu, 

 canali brevi, labia iuterno imdio ctrciiato, supra incras- 

 sato et cawdiculato, iii/m in. colmiiellaiii lalam ia- 

 crassalam desiiienle ; opercido conieo. vinllispirali. 



Shell subfluviatile, club-shaped, pyramidal, turreted ; whorls 

 numerous, angular; aperture subquadrate, canal short, 

 inner lip arched in the middle, thickened and cana- 

 liculuted above, ending ijeneath in a broad thick- 

 ened columella ; ojjcrculnni horny, nmltispiral- 



But for the very distinct, broad canal in which the 

 mouth terminates in the two species composing this 

 genus, they might have been very well included in the 

 genus Lampauia. 



Species 1. (Fig. a, b, Mus. Cuming.) 



I'oTAMiDES Pacificus. Pot. testa pyramidali, fnsco-iii- 

 yresceide ; aiifractibus acute elevalis, lavibus, ad an- 

 gulum nodosis, ultimo prope latiis snbcarinato ,- ii-per- 

 turd suhquadrald, labia interna calloso, colunielUi tor- 

 tud, labra augulato, siuuato, canali lata. 



The Pacific Potamides. Shell pyramidal, blackish- 

 brown; whoi'ls acutely elevated, smooth, nodose at 

 the angle, the last slightlv carinated at the side; 



aperture subquadrate, inner lip callous, columella 

 tortuous, outer lip angular, sinuous, canal broad. 



SowEKBY, Genera of Shells. 



Hab. Touibey, Peru, on mud banks ; II. Cuming. 



Species 3. (Fig. a, b, Mus. Cuming.) 



Potamides ebeninus. Pot. testa pyramidali, iurritd, 

 fusca-nigrescenti, angulatd, ad angiduni nodosa, spira- 

 liter liratd ; aiifractibus aiigidatis, nltimo ad /at us 

 univaricosa ; aperturd alba, prope marginetn fuscu 

 linctd, magna, versus spirant elevatd, labra e.vleritit 

 expanso, sinuato, labia iidernojuliaceo, medio arcualu^ 

 supra et infra, incrassalo, canali brevi, lata. 



The ebony Potamides. Shell pyramidal, turreted. 

 blackish-brown, angulated, nodose at the angle, spi- 

 rally ridged ; whorls angular, tiie last w'ith a varix 

 at the side ; aperture white, tinged with brown near 

 the margin, large, raised towards the spire, outer lip 

 expanded, sinuous, inner lip foliated, ai'ched iu the 

 centre, thickened above and beneath, canal short, 

 wide. 



BllUGHlERE, Diet., Cerdhium, n. 36. 



Hab. Australia. 



This well-known shell is characterized by a reniarkably 

 expanded aperture. 



May, 18GG. 



