MOLLUSCA. 45 



Readily distinguished from any species hitherto described by the transverse, 

 somewhat distant, and regularly disposed dark lines. 



183. Mabginella Belcheri, Hinds, Proceed. Zool. Soc. 1844, March, (Plate XIII, fig. 1, 2, 3, 

 4, 5.) Testa concinne ovata, alba, lineis eleganter punctatis, raris, frequentioribus, vel confertis 

 transversim dispositis, interdum albo fasciata ; spira mediocri, conica ; labro incrassato, albo, prope 

 medium subdilatato, intus lrevi ; columella quadriplicata. 



Inhab. Cape Blanco, west coast of Africa. In twelve to fifteen fathoms, 

 sand. 



This very beautiful species displays a 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 they gradually become more and more 

 covered, till in some the whole surface is quite darkened. In this latter case, 

 irregular lines become conspicuous in the longitudinal direction. In many speci- 

 mens the transverse lines are separated by intervals which permit the ground 

 colour of the shell to show through like milk-white bands. The outer lip seems 

 to retain in all cases its uniform white colour, and at its upper part is slightly 

 emarginate, but becomes thickened at and a little beneath the centre. 



184. Mabginella scripta, Hinds, Proceed. Zool. Soc. 1844, March, (Plate XIII, fig. 16, 17.) 

 TestS. parva, retuse ovata, cinerea, lineis nigris longitudinalibus valde angulatis (zig-zag) sparsim 

 litterata. ; spir& retusissimS ; labro intus denticulato; columella quinqueplicata, plicis duabus supe- 

 rioribus transversis. 



Inhab. Straits of Macassar. In eleven to fourteen fathoms, coarse sand. 

 A pretty, neat, small species, covered with characteristic zig-zag lines, rather 

 broadly shouldered, and having five folds on the columella. 



185. Mabginella sapotilla, Hinds, Proceed. Zool. Soc. 1844, March, (Plate XIII, fig. 10, 

 11.) Testa elongate ovata, fere subcylindraceo-ovata, cinerea vel glaucescente, concolore ; spira 

 retuso-conica ; aperturS intus fusca ; labro incrassato, recto, albo, postice fulvo, intus lsevi ; colu- 

 mella, quadriplicata. 



Inhab. Panama. In five to thirteen fathoms, sandy mud. 



The American analogue of M. pruuum, than which it is of smaller size, more 

 cylindrical in shape, whence results 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. pruuum. Both species present 

 a rich brown colour within the aperture, and in general appearance they are 

 remarkably alike. 



186. Mabginella vitrea, Hinds, Proceed. Zool. Soc. 1844, March, (Plate XIII, fig. IS, 19.) 



N 



