20 



times with light brown cloudings ; base rather round, aperture narrow, 

 columellar side nearly straight, with four nearly transverse equidistant 

 plaits at the anterior portion, the first continuing to form the inner 

 side of the channel, the second and the third passing obliquely for- 

 wards over the base, and the fourth in no degree so ; lip slightly spiral, 

 inflexed, thin, and deeply serrated at its entire edge, forming sixteen 

 to eighteen teeth ; margin thick, and continuous over the arch of 

 the channel, and, Uke the lip, is of a lighter colour than the rest of 

 the shell ; spire somewhat prominent, whorls distinct ; apex rather 

 obtuse. 



Long, yVo of an inch ; wide, ^^ of an inch. 



Hab. The Mam-itius. 



Cab. Cuming. 



This species approaches nearest in form to the Marg. triticea of 

 Lam., but has a much narrower aperture, and the edge of the lip is 

 strongly serrated its entire length. 



Marginella contaminata. Marg. testa, oblongo-ovatd, pallid^ 

 fioris lactis colore; extus tenuissime striata; aperturd latd, 

 labio crasso, columelld sexpHcatd, plicis tribus anticis promiyien- 

 tioribus ; margine lato, planulatoque ; apice prominente obtu- 

 sissimo. 



Shell oblongo-ovate, of an uniform pale cream colour, without 

 bands or markings ; internally the colour is somewhat darker ; ex- 

 ternal texture of the shell is finely striated : the striae terminate ante- 

 riorly at the thickened varix over the arch of the channel curving to- 

 wards the columella, and in a similar manner at the edge of the white 

 deposit around the spire ; base round, aperture wide, slightly curved; 

 on the columella are six or more white plaits, the three anterior being 

 rather prominent, the first contmuing to form the inner side of the 

 chamiel ; the second forms a varix on the base of the shell ; the 

 channel broad and deep ; a white deposit exists on the columella 

 within the aperture, which widens and thickens outwardly from about 

 the anterior fourth of the aperture, covering the plaits and proceeding 

 over the arch of the channel, forming there a ridge or varix at its 

 posterior edge, and diminishing in width as it approaches the lip, 

 along the whole length of which it continues forming a broad flat 

 margin, and terminates around the spire, which is also covered by it : 

 apex slightly prominent, very obtuse. 



Long, 1 inch ; wide, ^ of an inch. 



Hab. ? 



Cab. Cuming, Gaskoin. 



It differs from Marginella cornea, Lam., in its more elongated 

 form, the number, distribution and construction of the plaits, in its 

 broad, flat margin, in the thinness and planeness of the lip internally, 

 the varix at the anterior part of the base, &c. 



Marginella lineato-labrtjm. Marg. testd ovatd, leevi, an- 

 fractibus postice rotundatis, pallida Jlavescente, nigro lineato- 

 punctatd ; spird prominente ; basi rotxmdatd ; aperturd latis- 

 simd ; columelld quadriplicatd ; labio crassiusculo, marginato. 



