KENTUCKY GEOLOGICAL SURVEY. 49 



5 mm. in thickness and from 2 to 4 times as much in breadth, 

 rising from a basal expansion which encrusts other organisms. 

 Surface smooth, hirsute from the projecting acanthopores when 

 these are preserved. Apertures irregularly oval, often indented 

 by the strong acanthopores, 6 or 7 in 2 mm. In the immature 

 region the zooecia have thin walls, and few diaphragms; in the 

 mature region the walls are much thickened, and diaphragms 

 more numerous. A considerable number of mesopores inter- 

 spersed among the zooecia. Acanthopores very large and promi- 

 nent, situated at the angles of junction and between the walls. 

 Occurrence : A very abundant form in the Eden. Collected 

 at Newport and Covington, Ky., and Cincinnati, Ohio. 



CREPIPORA VENUSTA (ULRICH). 



Plate 2, fig. 7. 

 Chaetetes venustus. Ulrich, Jour. Cincinnati Soc. Nat. Hist., vol. 1, p. 93, 



pi. iv, 7, 7a, 1878. 

 Crepipora venusta. Ulrich, Jour. Cincinnati Soc. Nat. Hist., vol. 5, p. 257, 



1882. 



Zoarium consisting of hollow branches, bifurcating, or 

 branching otherwise, at variable intervals, growing from a 

 broad expansion which is covered on the lower side by a heavy, 

 strongly wrinkled epitheca. Branches from 6 to 20 mm. in 

 diameter, the hollow part usually filled with clayey material. 

 The basal epitheca continues up into the branches. Substance 

 of zoarium surrounding the hollow part from 2 to 5 mm. thick. 

 Surface smooth, marked with maculaB, composed of from 30 to 

 80 minute tubuli (mesopores ?). Apertures subpolygonal, with 

 thin interspaces: lunarium not very conspicuous, its ends pro- 

 jecting slightly from the walls. Zooecia with diaphragms from 

 1 to 2 times their diameter apart. Mesopores with closely set 

 diaphragms. 



Occurrence: Lower Eden at Covington, Ky. Also collected 

 by Dr. Aug. F. Foerste at Rogers Gap, Ky. 



