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Show 14 MR. H. ADAMS ON NEW SHELLS. [Jan. 9, incrassato, expansiusculo, marginibus callo crasso junctis, dextro subsinuato. Long. 15, diam. 4 mill.; ap. 4 mill, longa, 3 lata. Hab. Mauritius. This species was received with the name palangula attached to it. But the true palangula is, according to M. Morelet, who has had an opportunity of seeing that species in Ferussac's collection, the same as teres, Pfr. I have therefore considered it necessary to describe it as new. Fam. GALEOMMIDAE. Genus THYREOPSIS, H. Ad. Testa cequivalris, ce quit ater alis, trigono-ovata, aperta ; dorsali convexo, ad umbones subacute Cardo edentulus, liga-mento interno sub umbonibus instructus. THYREOPSIS CORALLIOPHILA, H. Ad. (Pl. IV. figs. 8, 8a.) T. testa solidiuscula, subpurpurea, ad margines pallidiore ; super-ficie valvarum concentrice striata, marginibus dorsalibus paulum elevatis, rugosis ; umbonibus parvis, leevibus, approximatis. Long. 10, alt. 4 mill. Hab. Mauritius. In this singular genus the valves are always widely separated ; and when they most nearly approach one another, the shell may be likened to a depressed Emarginula cut through the centre lengthways. It appears to have more affinity with Libratula, Pease, than with Ga-leomma, but differs so much from the former as to render it desirable to constitute a new genus to receive it. Mr. Nevill informs me that it was found alive by his friend Dr. Power on a coral-reef at Mauritius, and that the animal could barely enter the shell. It would appear to be parasitic upon the coral, which is also probably the case with Libratula, as Mr. Pease states that he found that genus living on coral. In Libratula the animal does not extend beyond the shell. Note.-In a former paper read by me on new species of Mauritian Shells, some observations on the animals by Mr. G. Nevill were appended to the descriptions, in which the expression " mantle" should correctly have been written "foot," and "foot" should have been "sole of foot." 5. Descriptions of some New Species of Land and Marine Shells. By H E N R Y A D A M S , F.L.S. (Plate IV.) M A C R O C H L A M Y S TENUICULA, H. Ad. (Pl. IV. fi°*. 9.) M. testa aperte perforata, turbinata, tenui, sublcevigata, levissime spiraliter striatula, rufo-cornea, diaphana, nitida ; spira |