OCR Text |
Show 388 DR. H. L. JAMESON ON THE [Apr. 16, Species 19. MARGARITIFERA IMBRICATA. Avicula imbricata, Reeve, 1857, sp. 11 ; Philippines. Type in B.M. ( = 31. vulgaris, fide Cooke, 1886.) Avicula muricata, Reeve, 1857, sp. 12 ; Philippines. Type in B.M. ( = M. vulgaris, fide Cooke, 1886.) Types, figures, and descriptions quite iuseparable. Both species may well be the young of the White Banda. Species 20. MARGARITIFERA CHEMNITZII. Avicula chemnitzii, Philippi, 1849, p. 19; China Sea. Chemnitz, 1785, vol. viii. tab. 80. fig. 720 ; Tranquebar (ref. Philippi): ? = M. vulgaris. Avicula (Meleagrina) chemnitzii, Philippi, Dunker, 1872, p. 15, pi. 3. fig. 5; China Sea. Dunker suggests that M. lentiginosa (Reeve) = 31. chemnitzii (Philippi). Species 21. (Unlocalized.) MARGARITIFERA CETRA. Avicula cetra, Reeve, 1857, no. 28 ; no loc. Type in B.M. Species 22. MARGARITIFERA PITCAIRNENSIS, n. sp. For Avicula pica, Gould, Reeve, 1857, sp. 71; Pitcairn Island. Tvpe in B.M. '(Not Avicula pica, Gould, 1852, p. 443, pi. 39. fig. 549.) Type sp. Mus. Cuming, B.M. I cannot agree that Reeve's Avicula pica Gould, from Pitcairn Island, is the same species as that figured and described by Gould from Samoa. Reeve's type specimen is a dwarfed thick-shelled example of a mollusc that normally resembles 31. vulgaris very closely. The Mus. Cuming specimens, from among which my type is selected, and which are probably paratvpes of Reeve's species, are very like some specimens of Australian and N e w Guinea Lingahs. In the absence of evidences of intergradation, I am treating this Pitcairn shell as distinct frotti the latter. If further material is procured, it may be found to be a local race of M. vulgaris. Size and form as in 31. vulgaris, but with the processes of the lip-margin thicker and more rounded, resembling those of 31. lurida Gould and 31. panasesce n. sp., rather than those of the Lingah shells. The transverse dark and light marks on these processes, so characteristic of 31. vulgaris, are absent. The ground-colour of the shell is w bite, with a number of radial bands of dark red or purple-brown, which, as iu 31. vulgaris, are quite different in their number and relations in different individuals. Interior of the lip white, with red or purple blotches. Nacre lustrous, slightly golden in tint. The characters of the lip-processes and the prevailing white grouud-colour distinguish this shell from typical M. vulgaris. The white grouud-colour occurs occasionally in the Trobriand Island M. vulgaris and in Lingahs from other localities. |