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Lamnoid sharks (order Lamniformes) are typically large and uncommon, making them difficult to study. White sharks Carclzarodon carcharias are no exception, and they pose the additional problem of being potentially dangerous to researchers. As a result, little is known about their biology, ecology, and behavior. ln particular, our knowledge of reproduction in white sharks is rudimentary and is based partly on infer-ences drawn from other lamnoids. The reproductive mode is thought to be aplacental viviparity, with em-bryos being nourished by oophagy (Compagno, 1984b; Uchida et al., 1987; Bruce, 1992; Gilmore, 1993).