new Species of Marginellidse. 201 



structa ; labrum medio leviter compressum, margine incurvatura, 

 extra valde incrassatum, fasciarumque fhiibus bene notatum. 

 Long. 10| mill., diam. 5. 



At first I was inclined to consider this species but a variety 

 of M. obscura, Reeve, ' Conch. Icon.' f. 132 ; but on a more 

 careful comparison with the type of that species, there appear 

 sufficient differences whereby the two forms may be recognized. 

 The figure above quoted gives a very fair idea of the form of 

 the present species, except that it does not display the slight 

 contraction of the labrum near its middle, and the apex is 

 perhaps a trifle too acuminately elevated. The bands are thus 

 disposed : just below Jdie suture there is a very broad one, 

 which is sharply defined above but not so beneath, but gra- 

 dually blends into the ground-colour of the shell ; a little 

 below this there are two narrow lines close together, then a 

 single one round about the middle of the whorl, then two 

 more approximated, which terminate at the base of the labrum. 

 M. obscura has five equidistant bands, as shown in Reeve's 

 figure ; and the plaits on the columella are not precisely the 

 same as in verdensis ; for the two basal ones are quite separate, 

 whereas in the latter species they are joined at the base. 



The interior of the aperture displays a similar coloration to 

 the exterior of the shell, the bands being conspicuous. All 

 the bands are rather more deeply coloured on the varix which 

 borders the labrum. 



2. Marginella (Volvarina) mediocincta, sp. nov. 



Testa ovato-cylindraeea, nitens, saturate rufo-fusca, circa medium 

 fascia lata alba cincta, atque ad columellas basim alba ; aufractus 4, 

 sutura alba sejuncti ; spira perbrevis ; apertura angusta, ad basim 

 leviter dilatata, longitudinem testae totoe fere sequans ; columella 

 superne convexiuscula, inferne plicis quatuor, duabus superioribus 

 quam inferioribus minoribus, munita ; labrum margine albo, extra 

 late iucrassatum, incrassatioue linea alba limitata. 



Long. G| mill., diam. 3. 



This pretty species is so well distinguished by its style of 

 coloration that it cannot be confounded with any other. With 

 the aperture towards the eye, the white zone is situated rather 

 above the middle of the shell ; but on the back of the whorl 

 it is about central. The broad varix which margins the ex- 

 terior of the labrum is bordered by a thin white line ; and the 

 edge of the lip is also white, and likewise the base of the 

 columella and the plaits with which it is furnished. The same 

 figure which I quoted with regard to the preceding species 

 may be cited as a guide to form with reference to the present, 

 which, however, is not so elongated. 



