Cystiphyllum granilineatum Horn Coral

Here is a Silurian horn coral found in the Louisville Limestone layer in Louisville, Kentucky. It is called Cystiphyllum granilineatum.

Identification from Erwin Stumm's Silurian and Devonian Corals of the Falls of the Ohio pp. 51-52 (description) and plate 6 pp. 96-97.