sphragis

The plastic mass begins to harden quite rapidly, probably within a few minutes but, as largely hollow sphragides have been dissected from pairs killed in copula, possibly more than one ejaculation may be required to complete the body of the sphragis.

This made Lenian earth the first sgillated medicinal earth and wherever in literature the term terra sigillata appears without a location suffix, it refers to Lemnian earth, sometimes called Lemnia sphragis which is Greek for terra sigillata from Lemnos.