Abstract
1. The epithelium of the archinephric duct in the opisthonephric kidney of the sea lamprey, Petromyzon marinus, has the ability to absorb small quantities of exogenous protein. It is doubtful however, whether the epithelium performs this function in normal protein loads. 2. The lateral intercellular spaces demonstrate a capacity for bidirectional transport of these tracers, suggesting that the intercellular spaces may play a role in the transport of solutes. Energy for this process may be provided by mitochondria-rich cells within the epithelium. 3. These results are discussed in relation to the capability of the sea lamprey to osmoregulate in freshwater and saltwater environments.
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