occasional masses or small nodules of limestone and pebbles. However that may be, there are not a few fragments of worn limestone and

Side View of Skull and Femur found in the Tunnel. From a photograph by Mr. M. C. Long.

Front View of the Skull, Tibia and Femur of Adult Skeleton, with Maxilla of Child in foreground. From a photograph by Mr. M. C. Long.

occasional pebbles, for the most part of local origin. Otherwise the material of the walls and roof everywhere is a fine, siliceous, sharp