. Bulletin of the British Museum (Natural History). . 23b Figs 322-323 Mytilopsis leucophaetus (Conrad). BMZD 1984239; Recent; Green Cove Springs, Black Creek (tributary of St John's river), Florida; attached to submerged wood, collected live 28. 6. 1983 by Messrs Dan C. Marelli & Michael J. Grecnberg. 322a, b, left valve external, internal, both x 3; c, detail showing septum and apophysis, x 10. 323a, right valve internal, x 3; b, detail, x 10. Dreissena sowerbyi d'Orbigny, 1850, Upper Eocene, England and Mytilus brardi Brongniart, 1823, Aquitanian, Europe. Generic distribution.
. Bulletin of the British Museum (Natural History). . 23b Figs 322-323 Mytilopsis leucophaetus (Conrad). BMZD 1984239; Recent; Green Cove Springs, Black Creek (tributary of St John's river), Florida; attached to submerged wood, collected live 28. 6. 1983 by Messrs Dan C. Marelli & Michael J. Grecnberg. 322a, b, left valve external, internal, both x 3; c, detail showing septum and apophysis, x 10. 323a, right valve internal, x 3; b, detail, x 10. Dreissena sowerbyi d'Orbigny, 1850, Upper Eocene, England and Mytilus brardi Brongniart, 1823, Aquitanian, Europe. Generic distribution. Fossil: Eocene-Miocene; western Europe. Late Oligocene; Panama and Pacific drainage, Peru. Neogene; Amazon, Caqueta and Magdalena Basins of nor- thern South America, Caribbean and southern United States (Florida and Texas). Recent (endemic): eastern seaboard, United States; Gulf of Mexico; Caribbean; Pacific coast, Panama to northern Ecuador. Recent (? introduced): Rhine-Scheldt delta (Adam 1960, Wolff 1969); west Africa (Pilsbry & Becquaert 1927: 455-7); Panama; Fiji; India (Morton 1981). REMARKS. In this paper fossil occurrences of M. sallei Recluz are recognized for the first time. Those Pebasian fossils, from the Upper Amazon Valley and other South American locali- ties, which cannot be matched with any living specimens are assigned to the extinct M. scripta (Conrad). Both Keen (in Moore 1969: N644) and Eames (in Morley Davies 1971: 245) recorded the genus as living in Asia, and it is probable that they were both following Dall (1898: 809) who stated that Congeria occurred in China. There appears to be no evidence for this. Morlet (1884: 402) described Dreissena crosseana and (1892a: 85; 18926: 329) D. massiei from Cambodia: examination of these (in BMZD) shows that they belong to Sinomytilus Thiele, 1934 (Mytilacea). The shape of Mytilopsis is very simple, with few tangible diagnostic features, and because it is bysally attached and often lives crowded together, it te
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