5 477. n. 20.
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This collection contains a considerable number of specimens of a shell
agreeing with the short specific character given by Lamarck of the above;
but as it has not been figured, I have referred to it with a mark of
doubt. The shells are rather solid, white, or white variegated with
purple, with numerous concentric wrinkles, which are more distinct nearer
the margin; the umbones, covered with a thin pale periostraca, nearly
smooth and polished, with a small purple spot, the inside white, with the
disk and posterior slope purple; the anterior and posterior slopes
distinct, the lunule and escutcheon deeply and distinctly sulcated;
length fourteen-tenths of an inch; height one inch.

3. Mactra ovalina, Lam. Hist. 5 477.

This shell is nearly of the same shape as the last, but the anterior
slope is rounded and circumscribed, and the posterior only marked by a
raised line in the periostraca. The shell is thin, white; with a pale
brown and deeply grooved escutcheon.

4. Solen truncatus, Wood. Conch.
Solen ceylonensis, Leach, Zool. Misc. 1 22. table 7.
Solen vagina, b. Lam. Hist. 5 451.
Icon. Wood. Conch. t. 26. f. 3. 4. Ency. Method. t. 222. f. 1.

5. Cardium tenuicostatum, Lam. Hist. 6 5.
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The shell when perfect is white, with rose-coloured umbones; the rose
colour is often extended down the centre of the shell, forming concentric
zones.

6. Lucina divaricata, Lam. Hist. 5 541.
Tellina divaricata, Gmel. Sys. Nat. 1 3241.
Icon. Chemn. Conch. 6 134. t. 13. f. 129.

7. Venerupis galactites, nob.
Venus galactites, Lam. Hist. 5 599.
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The fact of Lamarck having placed in the genus Venus this shell, which a
modern conchologist has considered as a variety of Venerupis perforans,
shows the very great affinity that exists between those genera.

8. Venus flammiculata ? Lam. Hist. 5 605.
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This shell is pale yellowish, with irregular, large, distinct, concentric
ridges, and distinctly radiated striae; the umbones smooth, polished,
orange-yellow; the lozenge lanceolate, purple; the inside golden-yellow;
the anterior and posterior dorsal margins purple.

9. Venus tessellata (n.s.)
Testa ovato-oblonga, albida, lineis purpureis angulatis picta; sulcis
concentricis, ad latus posteriorem lamellatis; marginibus integerrimis.
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Shell ovate-oblong, white, polished, with rows of square purple spots,
forming regular lines, with the points directed toward the back of the