78 NATICA. 



suturam albifasciatis, umbilico magno, callo spiral! an gusto ; 

 apertura semilunari, albida, labio interno late calloso et 

 medio calli lobato. — In form and colour resembling N. 

 aurantla, but differing in having a spiral callus. 



13. coLTJMNAEis, f. 37, Becluz. — Alba, nitens, oblique de- 

 pressa et lateraliter compressa ; umbilico latissimo, callo 

 spirali rotundo, apertvira obliqua, labio interno superne 

 calloso, ad umbilicum prominente lobato. — A white oblique 

 shell with wide umbilicus and thick spiral callus. 



14. ORiENTALis, f. 65,66, Gmelin. — Oblique globosa, alba 

 vel castanea spira acutiuscula, ultimo anfractu ad suturam 

 depresso crenulato, subito ad aperturam expanso ; umbilico 

 magno, intus spiraliter univaricoso, columella rectiuscula ad 

 varicem urabilicalem callosa. — Close to the suture the last 

 whorl is depressed, almost channelled, and crenulated at the 

 edge. 



15. ALBUMEN, f. 57, Lamarck. — Lata, aurantio-fusca, late- 

 raliter compressa, umbilico amplissimo, prope marginem 

 bicarinato, callo spirali latissimo crasso ; apertura semi- 

 lunata, magna ; labio interno calloso ad umbilicum latissime 

 lobato. — Remarkable for an oblique compression from back 

 to front, and the widest umbilicus with the thickest and 

 broadest spiral callus to be found in any species. 



16. HERDS, f. 8, Say. — Herculece si mills, magis conica, 

 tenuis et elevata, columella rectiuscula, angusta, vix callosa, 

 labio interno tenui. — Resembling N. herculea in general 

 form, but more upright and with a more conical spire. The 

 columella is straight and without the usual callus. These 

 differences are only somewhat exaggerated in N. duplicata 

 of Say, which cannot be regarded as distinct. 



17. POMUM, f. 19, Smith. — G-loboso-subturbinata, tenuis, 

 superne castaneo-purpurea, epidermide fusca induta ; spira 

 parva, anfractibus rotundis, ultimo magno, inflato, infra 

 subacuminato ; labio externo tenui, columella tenuiter et 

 simplice reflexa, umbilico obliquo, angusto. — -Of a light thin 

 texture nearly resembling an Am^pullaria. The columella 

 is thinly reflected over the body-whorl above, and forms a 

 simple sinuated edge over the umbilicus, which is narrow and 

 oblique ; mouth dull chestnut, the same colour showing 

 through the light brown epidermis. 



