Ryckholt's Melanges Paleontologiques, 1851-1862, with a New Name for Tudicula H. & A. Adams, non Ryckholt

Ryckholt's little known and seldom cited Me4langes Paleontologiques is discussed and dated. His names for invertebrate taxa of generic rank, most of which are mollusks from the De- vonian, Carboniferous, and Cretaceous of Belgium, are discussed and shown to be available. The genus Tudivasum nom. nov. (Gastropoda: Turbinellidae: Vasinae) is proposed to replace Tudicula H. & A. Adams 1864, which is preoccupied by Tudicula Ryckholt 1862. The resulting new combinations are listed. This replacement eliminates the confusion of Tudicula H. & A. Adams with Tudicla Roding 1798, which is also in the Turbinellidae. (Belgium, Carboniferous, Cretaceous, Devonian, Mollusca, Ryckholt, Tudicla, Tudicula, Tudivasum, Turbinellidael Between 1851 and 1862, Baron Philippe de Ryckholt published Melanges Paleonto- logiques, a three-part work on Belgian in- vertebrate fossils. The Melanges, in its en- tirety, is very rare and seldom cited. We know of only five complete copies of the Melanges: at Yale University (New Haven, Connecticut); the United States Geological Survey Library (Reston, Virginia); the In- stitut Royal des Sciences Naturelles de Belgique (Brussels); the British Museum (Natural History); and in the private library of the junior author. The British Museum did not complete its set until 1956 (J. Cooper pers. comm.).