RELATIONSHIP BETWEEN STREAM VELOCITY & DEPTH AND SNAIL SIZE DISTRIBUTION & DENSITY OF THE BALCONES ELIMIA, ELIMIA COMALENSIS (PILSBRY, 1890) (GASTROPODA: PLEUROCERIDAE) IN COMAL SPRINGS, TEXAS. - Perez, Kathryn E.; Minton, Russell L.; Reese, Scott A.; Hayes, David M. (Texas Journal of Science, 2011)