VOL. 44, NO.1
MALACOLOGIA
2002
CONTENTS

ANDREA C. ALFARO & ANDREW G. JEFFS

Small-scale Mussel Settlement Patterns Within Morphologically Distinct
Substrata at Ninety Mile Beach, Northern New Zealand. . . . . . . . . . . . . . . . . . . . .1

LUIS A. MERCADO, SERGIO H. MARSHALL, & GLORIA M. ARENAS

Detection of Phenoloxidase (PO) in Hemocytes of the Clam Venus antiqua. . . . . .17

ROBERT T. DILLON, JR., & ANDREW J. REED
A Survey of Genetic Variation at Allozyme Loci among Goniobasis
Populations Inhabiting Atlantic Drainages of the Carolinas. . . . . . . . . . . . . . . . . .23
SINOS GIOKAS & MOYSIS MYLONAS
Spatial Distribution, Density and Life History in Four Albinaria Species
(Gastropoda,Pulmonata,Clausiliidae) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
EUGENE V. COAN
The Eastern Pacific Recent Species of the Corbulidae (Bivalvia) . . . . . . . . . . . . .47

GENNADY M. KAMENEV

Genus Parvithracia (Bivalvia: Thraciidae) with Descriptions of a New
Subgenus and Two New Species from the Northwestern Pacific. . . . . . . . . . . . . 107
ANATOLY A. VARAKSIN, EUGENIA A. PIMENOVA, GAUNA S. VARAKSINA,
& LYDIA T. FROLOVA
Localization of Nadph-diaphorase-positive Elements in the Intestine of the
Mussel Crenomytilus grayanus (Mollusca: Bivalvia) . . . . . . . . . . . . . . . . . . . . . .135
VASILIS K. DIMITRIADIS & VASILIKI KONSTANTINIDOU
Origin of the Excretory Cells in the Digestive Gland of the Land Snail
Helix lucorum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
PABLO R. MARTÍN & ALEJANDRA L. ESTEBENET

Interpopulation Variation in Life-history Traits of Pomacea canaliculata
(Gastropoda: Ampullariidae) in Southwestern Buenos Aires Province,
Argentina. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .153

GAB-MAN PARK, TAl-SOON YONG, KYUNG-IL IM, & JOHN B. BURCH
Chromosomes of Pisidium coreanum (Bivalvia: Veneroida: Corbiculoidea:
Pisidiidae), a Korean Freshwater Clam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165


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