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, like the lip, is of a lighter colour than the rest of 
the shell; spire somewhat prominent, whorls distinct ; apex rather 
obtuse. 
Long, 535, of an inch; wide, ;45, of an inch. 
Hab. The Mauritius. 
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. testd oblongo-ovatd, pallideé 
froris lactis colore; extus tenuissimé striatd; aperturd latd, 
labio crasso, columelld sexplicatd, plicis tribus anticis prominen- 
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 striz 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 continuing to form the imer side of the 
channel; 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, 55 of an inch. 
Hab. g 
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-LABRUM. Marg. testd ovatd, levi, an- 
Sractibus postice rotundatis, pallidé flavescente, nigro lineato- 
punctatd ; spird prominente ; basi rotundatd; aperturd latis- 
simd ; columelld quadriplicata ; labio crassiusculo, marginato, 
