PALUDOMUS. 339 



Sub-gen. melantho, Bowdich. 



Shell ovate, solid, axis imperforate, whorls simple ; aperture 

 oval ; inner lip thickened. 



contorta, Shiittl. incrassata, Lea. 



decisa. Say. integra, Saij. 



decollata, Sewasch. obesa, Phil. 



fontinalis, Phil. obtusa, Trosh. 



genicula, Co7ir. patula, Brumati. 



Georgiana, Lea. ponderosa. Say. 



imperialis, Lea. subcarinata. Say. 



Sub-gen. laguncula, Benson (Bensonia, Cantr.). 



Shell turbinated, subglobose ; aperture large, oblong, entire, 

 peristome interrupted ; outer lip somewhat reflected ; umbilicus 

 deep and tortuous. 



pulchella, Bens. 



Genus PALUDOMUS, Swainson. 



Animal with the mantle-margin fringed. 



Operculum annular, nucleus subcentral. 



Shell thick, subglobose or conical, solid, imperforate, 

 smooth or tubercular, covered with an olivaceous epider- 

 mis ; spire small, shorter than the aperture, apex often 

 eroded ; aperture ovate ; inner lip convex, thickened ; 

 outer lip acute, the margin slightly reflexed, 



Syn. Hemimitra, Swains. 



Ex. P. spurcus, Eydoux and Souleyet, pi. 36, fig. 2. 

 Operculum, P. conicus, Gray, fig. 2, a. Shell, P. glo- 

 bulosus. Gray, fig. 2, h. 



The mantle-margin in this genus appears to be fringed 



