Volume 45 no. 2

VOL. 45, NO. 2
MALACOLOGIA
2004
CONTENTS

IRA RICHLING
Classification of the Helicinidae: Review of Morphological Characteristics Based on a Revision of the Costa Rican Species and Application to the Arrangement of the Central American Mainland Taxa (Mollusca: Gastropoda: Neritopsina).................................................................................195

RESEARCH NOTES

CLAUDIO G. DE FRANCESCO & FEDERICO I. ISLA
Reproductive Period and Growth Rate of the Freshwater Snail Heleobia parchappii (d’Orbigny, 1835) (Gastropoda: Rissooidae) in a Shallow Brackish Habitat (Buenos Aires Province, Argentina)....................443

ROGER J. HARO, RICK GILLIS, SCOTT T. COOPER
First Report of a Terrestrial Slug (Arion fasciatus) living in an Aquatic Habitat ...................451

ALEJANDRA RUMI, DIEGO E. GUTIERREZ GREGORIC, M. ANDREA ROCHE, & MONICA P. TASSARA
Population Structure in Drepanotrema kermatoides and D. cimex (Gastropoda, Planorbidae) in Natural Conditions............................................................................................................................453