Mr. A. Adams on new Species of Acephalous Mollusca. 233 alternate^ the secondary are trichotoQious, each forklet bearing three pediccllated flowers at its apex; the pedicles are 1 line long, and the flower expanded 3-4 lines diameter. The drupe is 1^ inch long, 9 lines diameter; the putamen is ligneous, its sides being 2 lines thick, its cell 5 lines in diameter, with the false septum, 1 line in thickness, reaching to the axis of the cell; the testa measures 5 lines across, and the tegmen 3 lines, both plicated in a horse-shoe form round the false septum. In the fruit I examined, the embryo was not perfected*. 2. Bursinopetalum macrophyllum, Thw. in Hook. Kew Journ. Bot. vii. 242; Enum. PL Zeyl. 43; — ramulis strictis, sub-augulatis, opacis, fuscis; foliis ovato-oblongis, imo subacutis, et in petiolum subdccurrentibus, apice rotundato-obtusis, marginibus valde revolutis, subcoriaceis, supra fuscis, con-vexis, nervis invicem 7-8 venisque reticulatis utrinque promi-nulis, subtus subpallidis ; petiolo costaque latiusculis, superne planis; corymbo terminali. — Ceylon, v.s. in herb, meo ; Ram-boddi, 5000 ped. altit. (Gardner, 100). Thist appears, by comparison with the foregoing, to be a very distinct species, as their characters respectively show. The leaves are 3^-4 inches long, 2-2j inches broad, on a petiole of 9 lines long and 2 lines broad. The fruit is of the same form, size, and structure as in the preceding species. 3. Bursinopetalum tetrandrum, Thwaites, Enum. PI. Zeyl. i. 42. — Ceylon. I saw long since, in Sir Wm. Hooker's herbarium, a plant collected in Malacca by Griffith, which in its habit and floral structure agrees with Bursinopetalum. Although its flowers arc tetrandrous, I hardly think it will be found identical with the Ceylon plant. XXVI. — On some new Species of Acephalous Mollusca from the Sea of Japan. By Arthur Adams, F.L.S. &c. Genus Corbula, Bruguiere. Corbula amplexa, A. Adams. C. testa transversim ovata, subtrigonali, valde insequivalvi, ssepe epidermide tenui fusca induta ; valva dextra valvam sinistram amplectente, tenui, alba, concentrice striata, ad marginem ventralem * Structural details of this species will be shown in the ' Contributions, vol. ii. pi. 7'6. t A figure of this plant and section of its fruit will be given in the same work, pi. 73. 16*
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