Zoological Society. 63 



round and smooth ; aperture wide, especially at the anterior portion, 

 where the columella suddenly contracts in diameter, subspiral, curved 

 posteriorly ; channel very broad, which and the edge of the lip are 

 subpellucid and whitish ; at the anterior part of the columella are 

 four prominent rather tenuous plaits : the first two conjoin and form 

 the inner side of the channel ; the two posterior are on the columella ; 

 between the inner side of the channel and the anterior third of the 

 columella is a concavity ; lip thick, smooth, extends beyond the apex, 

 no trace of crenulation, strongly marginated, and the margin has its 

 upper edge or rim of a darker colour than the shell ; it proceeds over 

 the arch of the channel, and becomes obliterated just above the third 

 plait ; apex imperceptible. 



Long, 3^/^ of an inch ; wide, -^^-^ of an inch. 



Hab.—^. 



The only specimens I have seen of this species are an adult shell in 

 the cabinet of Mr. Metcalfe, and an adult and a young one in my own ; 

 all of which were brought to this country in H.M.S. the Samarang. 



It cannot be confounded with any known species of Marginella ; 

 the four narrow conspicuous red lines or bands, the two anterior plaits 

 being a bifurcation of the inner wall of the channel, the wide aperture, 

 and general form of the shell are ample distinctives. 



Marginella pudica. Marg. testa ohlongo-ovatd, albidd,fasciis 

 sex vet septem, transversis, continuis, pallidissime viridi-fulvis ; 

 maculis distmctis pallidissime hrunneis interruptis ; basi rotun- 

 datd ; aperturd latiusculd ; labia crasso, marginato, ultra api- 

 cem extenso ; columelld quinqueplicatd ; canali lata et profunda ; 

 margine interno labii minute denticulato ; apice lata, obtuso. 



Shell oblong-ovate, of a white colour, having six or seven very faint 

 greenish-brown bands traversing the shell from the border of the 

 aperture to the upper edge of the margin, interrupted by rather large, 

 distinct, very light-brown spots or markings ; these bands have be- 

 tween them broad white lines, which are the colour of the shell ; the 

 posterior end of the shell is in an evenly projecting ridge or varix, 

 surrounding the spire ; base round, colour of the shell ; aperture 

 rather wide, curved (bowed) ; lip thick, extending a little beyond the 

 apex, as described in reference to the posterior portion of the shell ; 

 margin rather thick, and extending over the arch of the channel ; the 

 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, -^^^ of an inch ; wide, J^^ 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 afiinity may be the Marginella tessellata. Lam., although 

 even that affinity is very distant ; in the size remarkably so. 



