144 EOCENE MOLLUSCA. 



outer lip, which is smooth within, nearly straight, and without the posterior dilata- 

 tion which characterises M. ovulata. 



Locality. — Estuary bed at Mead-end^near Hordwell. 



Size. — Axis, rather more than 3-10ths of an inch ; diameter, 2-10ths of an inch. 



No. 86. Marginella vittata. F. F. Edwards. Tab. XVIII, figs. 7 a — c. 



M. testa ovulata ; spird brevissimd, depressd: aperturd elongatd, mediocri, antice effusd, 

 profunde emarginatd; labro incrassato, intus obsolete crenulato; columella quadriplicatd, plicis 

 anterioribus fere cequalibus. 



Shell ovate-oblong, with a very short, depressed, almost hidden spire : aperture 

 long, moderately wide, curved at the posterior extremity, effuse in front, and deeply 

 notched at the base ; outer lip thickened along the outer margin, feebly crenulated 

 within; columella with three thickish, nearly equal folds in front, and an obscure one 

 behind. 



Although nearly resembling M. ovularis (Lamk.), this present species is easily 

 distinguished from that by the general shape, which is shorter and broader, by the 

 depressed spire, by the aperture, which is wider and without the contraction at the 

 middle characteristic of the French species, and by the folds, which are not so numerous, 

 and not quite so oblique. The narrower aperture, the smooth uncrenulate outer lip, 

 the more numerous folds, and the greater size of M. simplex, separate that species 

 from the present one. 



One of the specimens exhibits faint traces of several transverse bands, from 

 which circumstance the specific name is taken ; these bands are of a dark brown colour. 



Locality. — Headon Hill. 



Size. — Axis, 3-10ths of an inch ; diameter, rather more than half the length of the 

 axis. 



Family — Volutid^e. 

 Genus 23d. Voluta. Linn. 1767. 



Voltjta, Scopoli, 1777- 



— Bruguiere, 1792. 



— Lamarck, 1801. 



— Montfort, 1810. 

 Musica, Humphreys, 1797. 

 Plejona, Bolten, 1798. 

 Fulgukaria, Schum., 1817. 



Scaphella — Harptjla — Volutilithes, Swainson, 1840. 



Gen. Char. — Shell sub-ovate or elongately fusiform, more or less ventricose; volu- 



