346 Bulletin of Zoological Nomenclalure ON THE GENERIC NAMES "PLOTIA" ROEDING, 1798, AND " PYRAMIDELLA " LAMARCK, 1799, AND THE PRO-POSED VALIDATION UNDER PLENARY POWERS OF THE GENERIC NAME "PYRAMIDELLA" LAMARCK, 1799 (CLASS GASTROPODA, SUBCLASS PROSOBRANCHIA) By H. A. REHDER, Ph.D. {U.S. National Mvseum, Washington, D.C., U.S.A.) and L. FORCART, Ph.D. {Museum of Natural History, Basle, Sivilzerland) (Commission's reference Z.N.(S.)651) (Enclosure to a letter dated 17th February 1952) The generic name Plotia was introduced by Roeding in 1798 (Museum Boltenianum : 95) without a diagnosis but with a list of 15 specific trivial names. Of these 7 are nomina nuda, while the others have bibliographic references accompanying them. The first valid type selection for this genus was made by Pilsbry and Bequaert iu 1923 {Nautilus 64 : 68), the species so chosen being the sixth vahd species in Roeding's hst, Plotia lineata Roeding (: 96). This species is an objective junior synonym of Trochus dolabralus Linnaeus, 1758 {Syst. Nat. (ed. 10) 1 : 760) the tjT^e species, by monotypy, of PyramideUa Lamarck. 1799 {Mem. Soc. Hist, not, Paris, An VII : 76). A strict adherence to the rules would, therefore bring about the replacement of PyramideUa Lamarck, 1799, by Plotia Roeding, 1798. 2. PyramideUa has, however, been in common use since its introduction, and is the type genus of the family pyramidellidae, a very large family of world-wide range and of considerable importance in paleontology. 3. In order to prevent the confusion that would result from the loss of such a common generic and famihar name, we ask the International Commission on Zoological Nomenclature :— (1) to use its plenary power (a) to suppress the generic name Plotia Roeding, 1798, for the purposes of the Law of Priority but not for those of the Law of Homonymy ; (6) to vaUdate the generic name PyramideUa Lamarck, 1799 ; (2) to place P</ra»M(?«//« Lamarck, 1799 (gender of generic name : feminine) (type species, by monotypy : Trochus dolabralus Linnaeus, 1758) on the Official List of Generic Names in Zoology : (3) to place Plotia Roeding, 1798, as proposed, under (l)(a) above, to be suppressed under the plenary powers, on the Official hulex of Reject&l and Invalid Generic Names in Zoology : (4) to place the trivial name dolabralus Linnaeus, 1758 (as pubhshed in the binominal combination Trochus dolabratus) (tri\aal name of type species of PyramideUa Lamarck, 1799) on the Offixnal List of Specific Trivial Names in Zoology ; Bull. zool. Notnend., Vol. 6 (August 1952)
On the generic names Plotia Roeding, 1798 and Pyramidella Lamarck, 1799, and the proposed validation under plenary powers of the generic name Pyramidella Lamarck, 1799 (Class Gastropoda, sub-class Prosobranchia)
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