or **ISCALIS**, in *Ancient Geography*, a town of the Belgae in Britain. Now Ilchester, in Somersetshire, on the river Ilt.

**ISCHÆUM**, a genus of plants belonging to the polygamia class; and in the natural method ranking under the 4th order, Graminae. See Botany Index.

**ISCHIUM**, in Anatomy, one of the bones of the pelvis. See Anatomy, No. 41.