114 MOLLUSCA FROM THE CRAG. 
these have been examined carefully, and their correct specific establishment is not at 
present upon a firm and stable basis; and my own species are not given with any 
great confidence, but more to call the attention of Collectors to their probable 
existence. 
Specimens apparently belonging to this genus have also been obtained at Barton 
from the London Clay or Older Tertiaries. 
1. Lepton squamosum, Montague. Tab. XI, fig. 8. 
SoLmn squamosus. Moné. Test. Brit., p. 565, 1803. 
— —_ Mat. and Rack. Linn. Trans., vol. vii, p. 48, 1807. 
—_ — Turt. Conch. Dict., p. 164, 1819. 
= — Dillw. Desc. Cat. Rec. Shells, p. 70, 1817. 
ie = W. Wood. Ind. Test. p. 16, 1825. 
PsaMMOBIA PUNCTURA. Brown. Ilust. Conch. Gr. Brit., pl. 16, fig. 7, 1827. 
Lepron squamosuM. Turt. Brit. Biv., p. 62, pl. 6, figs. aan 
— — Flem. Brit. An. p. 429, 1828. 
— — S. Wood. Catalogue, 1840. 
— — Thorpe. Brit. Mar. Conch., p. 49, 1844. 
— = G. Sowerby. Conch. Man., fig. 62, 1843. 
— — Forb. and Hanl. Hist. Brit. Moll., vol. u, p. 98, pl. 36, figs. 8, 9, 
and pl. O, fig. 6, 1849. 
LuTRARIA squamosa. Gray. Ann. of Philos., 1825. 
— — Hanley. Recent Shells, vol. i, p. 28, Supp., pl. 9, fig. 47. 
LEPTON SQUAMEUX. Chenu. Traité Blem., p. 47, fig. 148. 
Spec. Char, Testé ovato-trigonuld, equilaterali, compressa, tenui; utroque latere 
rotundatd, margine ventral leviter arcuatd; eleganter ornatd; dente cardinali unico, dentibus 
lateralibus magnis. 
Shell small, triangularly ovate, equilateral, thin, compressed; rounded on both 
sides, ventral margin slightly arched; elegantly ornamented externally ; hinge with 
one small central tooth and two large lateral teeth. 
Length, + of an inch. 
Locality. Cor. Crag, Sutton. Recent, British Seas. 
One specimen only of this species was found by myself in the sandy portion of 
the Coralline Crag, at Sutton. The interior is sufficiently perfect for comparison, but 
the markings upon the exterior are rubbed and obliterated, and although there is 
some slight difference in the outline of our shell, there is every reason to believe it 
belongs to the same species as that now living in the British Seas, and to which I have 
assigned it. The hinge area is large, furnished with a small central tooth, and a 
double set, as it were, of lateral teeth, the innermost of which are large, diverging at 
an angle of about 90°, those placed outwardly are small and close to the dorsal 
margin, between these are deep depressions for the reception of the lateral teeth of 
the opposite valve. The dorsal margin is short, not extending beyond the lateral 
