A survey of some of the ecological associations of the molluscan fauna found in a typical grassland situation was conducted on the Ross Natural History Reservation, Lyon and Chase counties, Kansas, during the summer of 1960. The collecting stations were selected for their differences in habitat conditions, and soil or water analyses were conducted at each. Associated vegetation was studied in detail. Six species of aquatic mollusks and 16 species of terrestrial snails were collected. Physa hawnii was the most common aquatic snail found, and Gastrocopta armifera the most abundant terrestrial species. Two pelecypods, Uniomerus tetralasmus and one Sphaerium, were found. Many specimens of Pupoides albilabris, Gastrocopta procera, Zonitoides arboreus, Vallonia parvula, and Succinea sp. were collected. Less abun- dant species, usually found in moist environments included Gastrocopta contracta, G. tappaniana, Helicodiscus parallelus, Retinella indentata, Hawaiia minuscula, and Stenotrema leai aliciae.