19 
columella is furnished with five plaits, the three anterior are promi- 
nent, especially the second, which extending over the base obliquely, 
forms a thickened varix ; small obtuse denticulations exist along the 
whole inner edge of the lip ; channel deep and wide ; apex broad and 
obtuse. 
Long, 28; of an inch; wide, ;48; of an inch. 
Hab. Central America. 
Cab. Metcalfe, Gaskoin, Cuming. 
In size, form, markings, fewer plaits, the denticulations on the 
inner edge of the lip, &c., separate this species from all others; its 
nearest affinity may be the Marginella tessellata, Lam., although 
even that affinity is very distant ; in the size remarkably so. 
MaRGINELLA TRIPLICATA. Marg. testd ovatd, ventricosd, ful- 
vescente, levi, nitiddque ; aperturd angustd ; labio tenut, inflezo, 
marginato ; columelld anticé triplicatd; canali nullo; spird 
subelatd, anfractibus distinctis, apice acutiusculo. 
Shell ovate, ventricose, of a general light fawn colour, without bands 
or other markings, smooth and shining ; base round, aperture rather 
narrow ; lip thin, much-inflexed, marginated ; three fine white plaits 
are situated at the anterior portion of the columella, equidistant ; the 
first forms the termination of the columella, the second passes very 
slightly on to the base, in a parallel direction to the first, the third 
not at all so; these plaits convey an idea as though they were differ- 
ently produced to those of the generality of the Marginelle ; that is, 
in not being formed on the columella, but as though the columella 
had been delved in itself, leaving the lines or plaits projecting; and 
the semblance of a fourth plait is given by the depth and abruptness 
of the notch beyond the third: chamnel none; spire slightly promi- 
nent, with distinct whorls; apex subacute. 
Long, 34, of an inch; wide, 2°, of an inch. 
Hab. The Philippines, &c. 
The gibbosity and sudden tapering of this shell, the uniformity of 
its coloration, in having but three plaits, and those at the anterior end 
of the columella, and its short but perfect spire, distinguish it from 
any species yet described. 
I had intended, on determining to describe this shell, to have re- 
tained for it the appellation by which it is so well known to many 
naturalists and collectors—Marginella angystoma, although by whom 
so designated I have been unable to learn, it never having before been 
described nor figured ; but finding afterwards that M. Deshayes has 
described and published a fossil species found at Grignon under that 
name, I am obliged to forgo my wish, and have called it from perhaps 
a more leading characteristic—Marginella triplicata. 
MARGINELLA SERRATA. Marg. testd elongatd, subcylindricd, 
pallidd; aperturd angustd; columelld antice quadriplicatd ; 
labio tenut, inflexo, valde serrato dentibus sex vel octodecim ; 
margine crasso ; spird subelatd, anfractis distinctis, apice obtu- 
siusculo. 
Shell elongated, subcylindrical, of a very light greyish colour, some- 
