Effects of a hen's egg yolk diet on certain inorganic elements in the snail Helisoma trivolvis (Colorado Strain)
JOYCE H. L. ONG, MICHAEL CHEJLAVA, BERNARD FRIED, AND JOSEPH SHERMA, p. 1
Habitat usage by the page springsnail, Pyrgulopsis morrisoni (Gastropoda: Hydrobiidae), from Central Arizona
MICHAEL A. MARTINEZ AND DARRIN M. THOME, p. 8
A light and electron microscopic study of pigmented corpuscles in the midgut gland and feces of Pomacea canaliculata (Caenogastropoda: Ampullarildae)
EDUARDO KOCK, ISRAEL A. VEGA, EDUARDO A. ALBRECHT, HUGO H. ORTEGA, AND ALFREDO CASTRO-VAZQUEZ, p. 17 Diversity and abundance of tropical American scallops (Bivalvia: Pectinidae) from opposite sides of the Central American Isthmus
J. TRAVIS SMITH, JEREMY B. C. JACKSON, AND HELENA FORTUNATO, p. 26
Additions and refinements to Aptian to Santonian (Cretaceous) Turritella (Mollusca: Gastropoda) from the Pacific Slope of North America
RICHARD L. SQUIRES AND LouELLA R. SAUL, p. 46
