Abstract
The Rob and Bessie Welder Wildlife Foundation Refuge is located in the Gulf Coastal area of south-central Texas. A collection of 20,000 molluscan specimens from this refuge was found to represent 13 families, 25 genera and 35 species of Gastropoda and one family, one genus and one species of Pelecypoda. The range of Pilsbryna tridens Morrison is extended from Palo Pinto County and Pl1nor- bina gracilentus (Gould) from Hays County, Texas. Gyraulus arizonsis (Pilsbry and Ferriss) is reported from Texas for the first time. The fauna is a composite of both tropical and northern forms. The tropical element is composed mostly of species in the family Planorbidae. A key to the species collected and an annotated list are presented.
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