86 NATICA. 



gata, superne ad suturam depressa. — Eesemhlicg N. aurantia 

 in colour, but broad and depressed, and with the umbilicus 

 so wide that the umbilical callus, although extremely wide 

 and tumid, only covers two-thirds of it. 



62. DUBiA, f. 56, Recluz. — Globosa stramineo-alba crassa ; 

 spira parva, ad suturam tumida, anfractu ultimo infra 

 marginato, columella latissime callosa umbilicum tegenti. — 

 More globose than any of the maTnilla group, witVi a broad 

 columellar callus partly covering the umbilicus, but not its 

 thickened broad border. 



63. PANAMBNSis, f. 18, Recluz. — Alba, globoso-subpyra- 

 midata, N. candidissim.ee similis, sed magis elevata, superne 

 angustior, umbilico latiori, callo spirali inconspicuo. — Like 

 N. candidissima in form, but more elevated and straight- 

 sided towards the spine ; the umbilicus open, with a very 

 depressed spiral callus. 



64. Vavaosi, f. 122, Le Guillou. — Alba pyramidata, 

 N. mamillcB similis, sed umbilico semiobtecto, callo columel- 

 lari ad umbilicum oblique contracto. — An extraneous deposit 

 sometimes appears on the upper whorls, which is not to be 

 mistaken for natural colour. The shell is of the mamilla 

 group, but the front callus is contracted obliquely towards 

 the columella at the umbilicus so as to cover only half of it. 



65. PYRAMis, f. 35, Reeve. — Alba pyramidata, spira elevata, 

 anfractibus declivibus, umbilico parvo, callo columellari ad 

 ultimum anfractum crasso ; apertura subtrigona. — The colu- 

 mellar callus leaves the greater part of the small umbilicus 

 open. 



66. Flemingiana, f. 99, Recluz. — Alba, nitens, crassa, 

 oblique pyramidata ; spira elevata, anfractibus convexiusculis ; 

 apertura brevi, superne oblique depressa, columella ad an- 

 fractum ultimum late callosa, ad umbilicum leviter lobata, 

 infra oblique contracta, umbilico mediocri, semiobtecto. 

 As in N. Vavaosi the umbilicus is only partly covered by the 

 slight oblique lobe of the columellar callus. 



67. mamillaeis, f. 68, Lamarck. — Pjramidata, fumoso- 

 fusca; spira elevata, anfractibus declivibus; umbilico elongato, 

 columella ad umbilicum lobata, callo spirali lato. — A thick 

 pyramidal shell with a prominent spiral callus. 



