19 



columella is furnished with five plaits, the three anterior are promi- 

 nent, especially the second, which extending orer the hase ohhquely, 

 fonns 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, Gaskom, 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 Maryinella tessellata, Lam., although 

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



Marginella triplicata. Marg. testa ovatd, ventricosd, ful- 

 vescente, Icevi, nitiddqve ; aperturei angustu \ labio temd, injlexo, 

 marginato ; columelld antice triplicata; canali mdlo ; spird 

 subelatd, anfractibus distinctis, apice acutiuscido. 



Shell ovate, ventricose, of a general hghtfawn 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 Marginellce ; 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 giveu by the depth and abruptness 

 of the notch beyond the third : channel none ; spire slightly promi- 

 nent, with distinct whorls ; apex subacute. 



Long, ^Q of an inch ; wide, -f^ 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 hut 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 — Margi?iella angystoma, although by whom 

 so designated I have been unable to learn, it never havuig 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. testa elongatd, subcylindricd, 



pallidd ; aperturd angnstd ; columelld anticb quadriplicatd ; 



labio temd, injlexo, valdh serrato dentibus sex vel octodecim ; 



margine crasso ; spird subelatd, anfractis distinctis, apice obtu- 



siusciilo. 

 Shell elongated, subcylindrical, of a very light greyish colour, some- 



