Cyprilepas holmi Wills 1962, a pedunculate cirripede from the Upper Silurian of Oesel, Esthonia

An account is given of about fifty examples of a pedunculate cirripede, Cyprilepas holmi Wills 1962, some still attached to the chitinous skin of Eurypterus fischeri Eichw. The bivalve chitinous shell and attachment peduncle of the cirripede are described. Comparison is made with the Cypris-larva. and early post-larval stages of the present-day Lepas