General guide to the exhibition halls of the American Museum of Natural History . (Right)THE RARE SLIT SHELL (Plearotomaria). A nearly extinct shell from deep water in the West Indies and near Japan, characterized by the broad slit extending partly around the outer whorl (Below, right) NORTHERN SCALLOP (Pecten islandicus): A form first discovered in Iceland (Below, left) THE PAINTED THORNY OYSTER (Spondy- lits pictorum). A beautifully tinted bivalve from Lower Cali-fornia. The spines are rose-red, orange or yellow.

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Keywords: ., bookcentury1900, bookdecade191, booksubjectnaturalhistorymuseums