52 Zoological Society. 



Hab. Cape Blanco, west coast of Africa ; in from twelve to fifteen 

 fathoms. 



Cab. Belcher. 



This very beautiful species displays considerable variation in the 

 character of its markings. In some individuals the exterior is nearly 

 white, with a few scattered transverse lines, composed of elegant 

 minute dottings, and these are perhaps the older shells ; from this 

 the)- gradually become more and more covered with them, till in some 

 the whole surface is quite darkened. In this latter case irregular 

 lines become conspicuous in the longitudinal direction. In many 

 specimens the transverse lines are separated by intervals, which per- 

 mit the ground-colour of the shell to show through like milk-white 

 bands. The outer lip seems in all cases to retain its uniform white 

 colour, and at its upper part is slightly emarginate, but becomes 

 thickened at and a little beneath the centre. 



Margixella sapotilla. Mar. testa elongate ovatd, fere subcy- 

 Uadraceo-ovatd ; cinered vel glaucescente, concolore ; spird retuso- 

 conicd ; aperturd int us fused ; labro incrassato, recto, albo,postice 

 fidvo, intus Icevi ; columelld quadriplicatd. Axis 11 lin. 

 Hab. Panama ; in from five to thirteen fathoms, sandy mud. 

 Cab. Belcher et Cuming. 



The American analogue of M. ceerulescens, or more correctly M. 

 prunum, than which it is of smaller size, more cylindrical in shape, 

 whence result its straight outer lip, less fullness and roundness of the 

 shoulders, but without any disposition to that obscure banding which 

 is visible in some specimens of M. prunum. Both species present a 

 rich brown colour within the aperture, and in general appearance 

 they are remarkably alike. 



Margixella coxstricta. Mar. testa albidd, obscure trifasciatd ; 

 spird retuse conicd ; anfractu ultimo prope medium coarctato ; labro 

 incrassato, medio incurvato, intus Icevi, superne ad spiram adscen- 

 dente ; columelld quadriplicatd. Axis S lin. 



Hab. ? 



Cab. Cuming. 



Margixella xivosa. Mar. testd ovatd, cinereo-fuscd ; maculis 

 lacteis laceratis super lineas longitudinales dispositis ; spird retiisd ; 

 labro subrecto, incrassato, albo, ad spiram adscendente, intus infra 

 medium heviter denticulato ; columelld quadriplicatd. Axis 9 lin. 



Hab. ? 



Cab. Cuming. 



A full-shaped oval shell of a fawn colour, with longitudinal lines, 

 as if marking the periods of growth, on which are aggregated small 

 irregular milk-white spots ; these are generally clustered on the lines, 

 but a few occupy the intervals between them. The outer lip is of 

 an uniform white, and beneath its middle are a few rather indistinct 

 denticulations ; above it ascends to the spire, which it renders cal- 

 lous on that side. Within it is of a pale fawn-colour. 



Margixella pruixosa. 3far. testd ovatd, coarctatd, albidd, obso- 

 lete trifasciatd, rtiaculis parvis lacteis conspersd ; spird conico- 



