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SPRINGSNAILS OF THE DEATH VALLEY SYSTEM, CA-NV: DESCRIPTION <br />PRELIMINARY ZOOGEOGRAPHIC ANALYSIS. <br />Robert Hershler, Department of Invertebrate Zoology, Natior <br />Museum of Natural History, Smithsonian Institution, Washinc_ <br />DC 20560 <br />Twenty-two species of springsnails (Gastropoda: Hydrobiidae) <br />known from permanent waters of Death Valley System, CA-NV. T <br />of these snails are very narrowly distributed, and local enc <br />are concentrated in Owens Valley, northern Death Valley, an( <br />Meadows. Zoogeographic patterns exhibited by these organism: <br />not strongly support the hypothesis that inter-connected <br />Pleistocene lakes within the area facilitated dispersal bet` <br />currently isolated drainages. Alternative explanations for <br />observed patterns are discussed. <br />AND <br />ial <br />[ton, <br />are <br />lost <br />lemics <br />l Ash <br />do <br />69