| VOL. 45, NO.2 |
MALACOLOGIA
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2004
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CONTENTS
IRA RICHLING |
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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 |
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| RESEARCH NOTES
CLAUDIO G. DE FRANCESCO & FEDERICO I. ISLA |
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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 |
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| ROGER J. HARO, RICK GILLIS, SCOTT T. COOPER |
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| 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 |
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| Population Structure in Drepanotrema kermatoides and D. cimex (Gastropoda, Planorbidae) in Natural Conditiona. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 453 |
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