A study of the ontogeny of the Thaumatocyprididae revealed that most species in the family have six juvenile growth stages. Each growth stage is described and illustrated. A table is presented for the identification of growth stages by using the number of claws on the caudal furca. Keys are presented for the identification of growth stages of Thaumatoconcha radiata and, also, for the identification of genera and species of the Thaumatocyprididae. A phylogeny is derived for the higher taxa of Ostracoda using the Hennigian system. In this phylogeny the suborders Cladocopina and Halocypridina are referred to a new order Halocyprida. The following new taxa are described and illustrated: Thaumatomma piscifrons, new genus, new species, from the Permian of Idhra, Greece, Danielopolina carolynae, new genus, new species, from the South Atlantic Ocean, and Thaumatoconcha radiata, new genus, new species, T. caraionae, new species, T. elongata, new species, T. hessleri, new species, T. polythrix, new species, T. punctata, new species, T. sandersi, new species, T. tuberculata, new species, and Thaumatoconcha species A, from the North Atlantic, South Atlantic, and South Pacific Oceans, and from within the Antarctic Convergence. All species are referred to the ostracode family Thaumatocyprididae (superorder Myodocopa). Supplementary descriptions and illustrations are presented of all previously described living and fossil genera and species of Thaumatocyprididae and some genera and species of the Paleozoic superfamily Entomoconchacea. It is hypothesized that during the Jurassic period, representatives of the Thaumatocyprididae lived on the continental shelves of what is now Europe; then, after the Jurassic, the group migrated down the continental slope in response to competitive pressures. Their descendants survive today in bathyal and abyssal depths of the world's oceans and, in one instance, in a marine cave in Cuba. OFFICIAL PUBLICATION DATE is handstamped in a limited number of initial copies and is recorded in the Institution's annual report, Smithsonian Year. SERIES COVER DESIGN: The coral Montastrea cavernosa (Linnaeus).

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Collection from the marine Alapah Limestone, Brooks Range, Alaska, contain abundant and diversified ostracodes and include growth series of several taxa referable to Paraparchites. Study of these populations and a review of the world literature make it possible to discriminate several new genera in this group. I conclude that the ostracodes in these genera should be oriented so that the plenate end is posterior; that dimorphism is shown in the width of the posterior and (or) width below the midheight; that the presence or absence of dorsoposterior spines is constant within genera, and that these spines or tubercles, unlike those in the Leperditicopida, are not eye tubercles; that adults of some genera in the Paraparchitidae may be smaller than instars of other genera in this group; and that reversal of overlap and hingement is not a taxonomic criterion in this group. The presence of a well-developed inner lamella and a cyprid adductor muscle-scar pattern in some of the genera remove this group from the Palaeocopida as presently defined. In order to document the above conclusions, several genera and species from areas other than Alaska are discussed and illustrated.

Komicker, Louis S., and I.G. Sohn. Myodocopid Ostracoda from the Late Permian of Greece and a Basic Classification for Paleozoic and Mesozoic Myodocopida. Smithsonian Contribu¬ tions to Paleobiology, number 91, 33 pages, 22 figures, 2000.-Four new genera and six new species are described from the top of the Episkopi Formation (Dorashamian) on the island of Hydra, Greece: Cypridinelliforma rex (new species), Nodophilomedes phoenix (new genus, new species), Swainella bex (new genus, new species), Triadocypris pax (new species), Siveterella pax (new genus, new species), Siveterella flex (new species), and Sylvesterella (new genus), based on specimens in the collection from Greece. Supplementary descriptions are pre¬ sented of Philomedes rankiniana (Jones and Kirkby, 1867) and Eocypridina radiata (Jones and Kirkby, 1874). A basic classification proposed for Paleozoic and Mesozoic Myodocopida includes a new suborder, three new superfamilies, and three new families. OFFICIAL publication DATE is handstamped in a limited number of initial copies and is recorded in the Institution's annual report, Annals of the Smithsonian Institution. SERIES COVER DESIGN: The trilobite Phacops rana Green.

This paper discusses and illustrates 17 species of ostracodes from the uppermost part of the Leonard formation or lowermost part of the Word formation and 1 species from the Wolfcamp and Leonard formations in the Glass Mountains, Texas. Also, 1 species from the Pennsylvanian of Oklahoma is illustrated for comparison. Thirteen of these species are new, and 1 unnamed. These are distributed in the following 14 genera,