Abstract
A set of fragmentary bones excavated from the Inversand Company Pit at Sewell, Gloucester County, NJ, contains portions of broken hollow femur bone that display unusual interior structure. Two hypotheses are considered; (1) the lumina represents the distinctive physical features of medullary bone as described by M. Schweitzer in a series of papers; or (2) the interior bone growth is a pathology. The specimen is attributed to the Theropoda on the basis of the possession of a pneumatic foramen in one of the bones. This specimen is from the upper part of the New Egypt Formation, just below the K/T boundary in the base of the overlying Hornerstown Formation. This stratigraphic horizon is the same as the type specimen of Dryptosaurus aquiluguis which was excavated from a marl pit nearby.
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