. Bulletin. Science; Natural history; Natural history. 1971 IOSSII. PELECYPODS 133. Figures 1 1-15. Noelia reserva (Sowerby). "Possible syntypes" of Area reserva Sowerby. BM (NH) (unnumbered). Recent. (?) Tumbez. Peru. Length parallel to hinge line about 40 mm: height about 33 mm. Photographs courtesy of and copyright by British Museum (Natural History). as tentative. Olsson (1942a) reported that "the form [of N. magna] tends to be longer or more regu- larly ; a statement which characterizes neither the holotype of N. magna nor most of the Recent specimens obser
. Bulletin. Science; Natural history; Natural history. 1971 IOSSII. PELECYPODS 133. Figures 1 1-15. Noelia reserva (Sowerby). "Possible syntypes" of Area reserva Sowerby. BM (NH) (unnumbered). Recent. (?) Tumbez. Peru. Length parallel to hinge line about 40 mm: height about 33 mm. Photographs courtesy of and copyright by British Museum (Natural History). as tentative. Olsson (1942a) reported that "the form [of N. magna] tends to be longer or more regu- larly ; a statement which characterizes neither the holotype of N. magna nor most of the Recent specimens observed. A list by Bosworth (1922) of mollusks from the tablazos of northern Peru, assigned by him to the Quaternary, consists entirely of species still living in the same general area. The Mancora Tablazo. presumed source of the type of N. magna, contains several extinct species as well, and was referred by Olsson (1942b) to the Late Pliocene. The discovery that two similar species of Noelia occur in the Panamic province calls into question the synonymy, first advanced by Reinhart (1935), of Noetia triangularis Gray and N. reversa (Sowerby). Reinhart's study showed that N. triangularis is not a synonym of Area ponderosa Say, 1822, as had been assumed by some earlier workers. Photographs of the holotype of N. triangularis. B M (NH) Reg. No. 1968856. supplied by Dr. J. D. Taylor. British Museum (Natural History), and reproduced here (Figs. 6-10) show a shell with 36 major radial ribs and a few smaller, intercalary ribs on the posterior slope of the valve. No undoubted type specimen of Area reversa Sowerby was located at the same institution, but photographs of a "'possible sy nt\ pe" supplied by Dr. Taylor (Figs. 11-15) show a speci- men with approximately 33 major ribs. Both names. Noetia triangularis and N. reversa. would therefore seem to apply to the same species, the common large Noetia of the Panamic province, which is reported to range from Puertecitos in the northe
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