Mesoleberis hollandica new species (Figs. 1, 2, Table 2) Etymology Named after location of specimens. Paratypes MAB k. 2412, specimen deposited in the National Museum of Natural History as USNM 1083966. MAB k. 2422, specimen deposited in Natuurhistorisch Museum Maastricht as NHMM 2005 0 31. MAB k 2408­2411, 2413 ­2421, individual specimens deposited in Oertijdmuseum De Groene Poort (Boxtel, The Netherlands). Stratum typicum Levels IVf­4 and 5, Meerssen Member (Maastricht Formation), uppermost Maastrichtian ( Belemnella (Neobelemnella) kazimiroviensis Zone). Description of Carapace Carapace oval in lateral view with short rostrum (rostrum broken off specimens illustrated in Figs. 1, 2) and indented incisure; posterior, ventral, and dorsal margins evenly rounded in lateral view. Short indented line present with dorsal end just posterior to midheight of incisure and ventral end at anteroventral valve edge ventral to incisure (Figs. 1,2). Valves of specimens in collection are the actual shells, not inner molds. Central adductor muscle scars: Numerous radiating scars; long axis of scar­complex slightly slanted with dorsal end slightly posterior to ventral end. Carapace size (Table 2): Maximum length 9.1 mm, maximum height 7.6 mm. Holes in carapace: Specimen illustrated in Fig. 1 A–E contains several round holes or pits (could not ascertain with certainty whether or not shell was completely penetrated) in the carapace. Holes or pits were observed in 2 of 16 valves examined (MAB k. 2407: 5 holes, 2418: 1 hole). Rims of holes do not appear to be raised or indented, but consist of an etched circle. Holes in a carapace may be formed by a boring organism, such as a naticid or muricid gastropod, for which the ichnogenus Oichnus Bromley 1981 is available (see discussions in Bromley 1981, 1993; Nielsen & Nielsen 2001, and Donovan & Jagt 2002). According to Reyment et al. (1987:192): “In relatively thin­shelled prey, such as ostracods, it is not always possible to identify the group to which the predator belonged.” The ...