208 NATICIDyE. 



Genus neverita, Risso. 



Operculum simple, cartilaginous. 



Shell orbicular, depressed; spire flattened; aperture 

 wide, semilunar; inner lip straight, callous; columella 

 adherent to, and spirally contorted in, the umbilicus, the 

 apex more or less dilated and truncate. 



Syn. Naticaria, Swains. 



Ex. N. Chemnitzii, Recluz, pi. 22, fig. 3. Operculum, 

 N. glaucina, Lamarck, fig. 3, «, 3, b. Shell, N. glaucina, 

 fig. 3, c. 



In this genus the spire of the shell is depressed, the 

 aperture very wide, and the large umbilicus is fiiniculate 

 and partially concealed by a callous, tongue-shaped, 

 shelly process ; the operculum is horny, and nearly closes 

 the mouth of the shell. 



Species of Neverita. 



albumen, Linn. Lamarckiana, Recluz. 



ampla, Phil. olla, 31. de Serr. 



bicolor, Phil. papyracea, Busch. 



Campechiensis, Recluz. patula, Sow. 



Chemnitzii, Recluz. Peteveriana, Recluz. 



conica, Lam. Philippiana, Recluz. 



didyma, Phil. Reclusiana, Desh. 



glaucina, Lam. unifasciata, Lam. 



Incei, Phil. vesicalis, Phil. 

 intermedia, Recluz. 



. Genus AMPULLINA, Lamarck. 



Shell ventricose, imperforate; spire with the apex acute, 

 whorls smooth, without epidermis; aperture very wide; 



