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Show 390 DR. H. L. JAMESON ON THE [Apr. 16, It seems to be most nearly related to 31. vulgaris, but the higne is shorter and the posterior " auricle " less pronounced. The lappet-like processes of the lip are short, strong, and rounded. External colouring greyish or greenish brown with dark radial markings. The inside of the lip is coloured much as in M. margaritifera. The general plan of marking is very much the same as in 31. vulgaris, but there is an entire absence of the reddish tints so characteristic of that species. Species 25. MARGARITIFERA PERNOIDES. Avicula pernoides, Reeve, 1857, sp. 34; no loc. Type in B.M. Species 26. MARGARITIFERA PANASES^E, n. sp. (Text-fig. 94.) ? Avicula metadata, Gould, 1850, p. 309; Tutilla, Samoa (praeocc). Avicula pica, Gould, 1852 (for A. maculata, Gould), p. 443, pi. 39. fig. 549 (praeocc. Philippi, 1849, p. 21). Not Avicula pica, Gould, Reeve, 1857, sp. 71. Type B. M . No. 1901.3.25.2, Conflict Atoll, British N e w Guinea ; coll. H . Lyster Jameson. (Panasesa, native name of chief island of Conflict Atoll; also used collectively to denote the entire Atoll.) Without an opportunity of examining Gould's type, it is impossible to say what shell he had before him. His figure and description strongly suggest the present species. Text-fig. 94. Margaritifera panasesce, nat. size. Shell somewhat convex, inequivalve, slightly oblique: rostrum distinctly marked off from surface of nacre internally by a sharp ridge Form as m 31. vulgaris, but with less pronounced posterior auricla. Teeth as in 31. vulgaris. Lip-processes shorter, more rounded, aud relatively thicker, with no trace of the dark and light circumterential or transverse markings so typical of the lip- |