Over enige tot nu toe uit het Middenplioceen van Nederland onbekende molluskensoorten, 2

This paper is the second part of a series begun in 1950 (Basteria, Vol. 14, pp. 20—27). It deals with several additional species new to the Dutch Middle Pliocene (equivalent to the British Waltonian): 8 gastropods, 1 scaphopod and 1 lamellibranch. Surprisingly all eight gastropods were found in one boring taken in the northern part of the Peel-horst near the River Meuse at a depth of 62—64 meters. At that depth the deposits most likely contain a number of mollusks derived from the upper part of the Lower Pliocene (equivalent to the British Coralline Crag). Some of the mollusks reported in this paper may possibly be derivatives, although hitherto there have been no records of them (except the lamellibranch) in our subsoil. Four of the gastropods are known from Pliocene deposits of Belgium and England, i.e. Solariella maculata, Scala clathratula, Scala cancellata and Terebra canalis. They represent new elements in Dutch Pliocene deposits. The last species, derived from submarine eroded strata, has already been found washed ashore on the beach in the province of Zeeland. Three other gastropods, i.e. Turritella tornata, Philine scabra and Philine quadrata, have not yet been reported from the continental part of the West European Pliocene. The most interesting species, Scala geniculata, was known only from the Italian Pliocene and it is a new element in the West European Pliocene. The scaphopod found in another boring seems to be identical with Dentalium rectum Gmelin as described and figured by HARMER (1923, Vol. II, Part 3, p. 816, Pl. 63, fig. 27). One valve of Leda pygmaea, the only lamellibranch reported in this paper, may have been derived from Dutch Miocene deposits. However, certain characters do not correspond with those of the Miocene specimens, whereas this specimen agrees perfectly with the description and figure given by WOOD (1850, Part II, No. 1, Biv., p. 59, Pl. 10, fig. 11a). Consequently, it is reasonable to assume that this specimen is not a reworked fossil from the Miocene.