Having had the privilege of examining the type specimens of Turrilepas scotica, Etheridge jun., and T. Peachi, Etheridge jun. and Nicholson, in Mrs Gray's collection, and in addition to them a large number of examples of the genus recently collected by Mrs Gray from the Girvan area, as well as many specimens in the Sedgwick Museum, Cambridge, from several horizons in the Haverfordwest district and from the Dufton Shales near Melmerby and from Bala beds of other localities, some important new features have been recognised in these curious fossils which help to throw light on their structure and relations.