Radiating Yellowish

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UNIO MISOOI.ENSIS. 259 NOTE XXXVI. Description of a new species of Unio BY M.M. Schepman Unio misoolensis, n. sp. Shell rather elongated, compressed, very inaequilateral, at the umbones laying about one sixth of the whole length of the shell, rather smooth, with numerous fine concentric striae; umbones little prominent, decorticated in the adult, half shells in grown with conspicuous radiating folds, more or less over the disk extending of the shell; moreover few the a radiating grooves occupy anterior part of the and shell, microscopic radiating wrinkles of the epidermis cover the posterior slope; epidermis reddish-brown in the adult, yellowish olive-green in the young ones. Upper margin slightly curved, anterior margin rounded, slightly protruded below; ventral margin incurved, posterior margin with the forming upper one a more or less obtuse angle, Notes from the Leyden Museum, Vol. XVIII. 260 UNIO MISOOLENSIS. regularly curved above, rounded below and running with the umbonal which is rather a very obtuse angle at ridge, obtuse, into the ventral margin. Ligament long, narrow, yellowish-brown. Nacre bluish white, more iridescent near the posterior than part, brownish near the umbones; scarcely more one in short, thick, crenated tooth each valve; a small knob in the left valve be considered as a second may perhaps tooth; lateral lamellae: 2 in the left valve, one in the right are curved, rather thick. one; they elongated, slightly rounded Anterior scars: a large one, which is rather and below the deep, a much smaller, very deep one, just line distinct. tooth; posterior scars very shallow; pallial anterior ventral Nacre much thickened near the part of margin, forming a callus, which is connected with another umbones callus, running from the to this ventral one. 16 Long 65, alt. near the umbones 24, diam. mill. Locality. Misool (Hoedt). — In the collection of the Leyden Museum. of this Unio the known The nearest ally , amongst spe- be Unio cies of the same geographical region, may Bec- carianus Canefri, or its variety a but it differs in Tapp. , shape and sculpture; the anterior margin in that species is not protruded below, the posterior part is much more and acuminated in Beccarianus and the line elongated , from the ligament to the posterior end is much straighter, while it is curved in the new species. Rhoon near Rotterdam, February 1897. Notes from the Leyden Museum, "Vol, XVIII..

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