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Show 304 MR. E. A. SMITH ON THE [Apr. 1, are therefore compelled to designate it Basterotia, the name given by Homes, who appears to have been ignorant of the fact that, not only Gray, but Recluz also, had previously recognized the existence of this generic group. LAS_EA ADANSONIANA (Recluz). Poronia adansoniana, Recluz, Rev. Zool. 1843, p. 174; id. in Chenu's Illus. Conchyl. pi. i. figs. 1 a-g. Hab. Senegal. LUCINA INCONSPICUA. (Plate XXII. fig. 6.) Testa minima, altior quam longa, mediocriter convexa, inaqui-lateralis, solidiuscula, albida, concentrice regulariter striata, striisque radiantibus vix conspicuis sculpta ; umbones acuti, antrorsum curvati; lunula profunda, parva; margo dorsi posticus leviter excurvatus; pagina interna nitida, ad marginem minute denticulata ; denies cardinales et laterales validi. Longit. 3 millim., alt. 3|, diam. 2. This species, although so small, is conspicuously solid. The umbones are well curved forward, producing a beaked appearance to the apex. The radiating striae are excessively fine and only visible iu certain lights, and seem to be lines below the surface. LUCINA (CODAKIA) COMPACTA. (Plate XXII. fig. 7.) Testa aequilateralis, mediocriter globosa, alba vel dilute citrina, concentrice et radiatim tenuissime et confertim lirata, minute cancellata ; umbones leviterprominentes ; lunula angusta, parva, mediocriter profunda; latus posticum obtusum, anticum rotun-datum ; margo inferior intus striatus, subcrenulatus ; ligamentum internum. Longit. 10 millim., alt. 9|, diam. 6. The dentition and the muscular impressions of this species are normal. The sculpture is so fine that it is almost invisible to the naked eye. Specimens were collected both by Capt. Turton and Mr. Melliss. It appears to be a common species. VERTICORDIA ORNATA (d'Orbigny). The three odd valves from St. Helena agree precisely with those described in m y Report on the Lamellibranchiata of the ' Challenger' Expedition, p. 166. Tbe synonymy and distribution of this species are there given. St. Helena is the most southern known locality. MYTILUS EXUSTUS, Linn. Mytilus exustus, Reeve, Conch. Icon. fig. 10; Clessin, Conch.- Cab. ed. 2, pi. 16. figs. 7, 8. Hab. West Indies, Brazil, U. States as far north as Charleston. A few small odd valves, received in 1865 from the Museum of Economic Geology, apparently belong to this species. |