64 Zoological Society. 



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

 vescente, Icevi, nitiddque ; aperturd angustd \ labia tenui, infiexOy 

 marginato ; columelld antice triplicatd ; canali nulla; spird 

 subelatd, anfractibus distinctis, apice acutiuscido. 



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 diifer- 

 ently produced to those of the generality of the MarginellcB ; that is, 

 in not being formed an 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 : channel none ; spire slightly promi- 

 nent, with distinct whorls ; apex subacute. 



Long, 3^0 of an inch ; wide, -^^^ 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 angystama, 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; calumelld antich quadriplicatd ; 

 labia tenui, injlexa, valde serrata dentibus sex vel actadecim ; 

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

 siusculo. 



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

 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, Y^^ of an inch ; wide, -^ of an inch. 



Hab. The Mauritius. 



Cab. Cuming. 



