56 KENTUCKY GEOLOGICAL SURVEY. 



branches, which divide dichotoinously at irregular intervals, 

 and vary in diameter from 7 to 20 mm. Surface smooth or al- 

 most so, with clusters of 7 to 15 larger apertures, which are 

 sometimes a very little elevated above the general level. Aper- 

 tures polygonal, often somewhat rounded from the thickening 

 of the walls, those in the clusters from 0.4 to 0.5 mm. in diam- 

 eter, while the others are a little over 0.3 mm. in diameter. 

 Zocecia thin-walled in the axial region, with diaphragms from 

 two to three times their diameter apart; in the peripheral re- 

 gion, they have the walls much thickened and diaphragms much 

 more numerous, Acanthopores small, very numerous, occupy- 

 ing the angles of junction and occurring also in the space be- 

 tween adjoining zooecia ; only rarely are they seen on the surface ; 

 this is probably due to the state of preservation of the material. 

 Occurrence : Found abundantly just at the top of the Fair- 

 mount beds, about one mile east of Mt. Sterling, Ky. The orig- 

 inal material was obtained from McKinney Station in Lincoln 

 county, probably from the same horizon. 



MONTICULIPORA MAMMULATA D'ORBIGNY. 



Plate 3, fig. 7. 



Monticulipora mammulata. D'Orbigny, Prodrome de Paleontologie, t. 1, p. 

 25, 1850. 



Chaetetes mammulatus. Edwards and Haime, Polypiers fossiles des Ter- 

 rains paleozoiques, p. 207, pi. xix, 1, la, 1851. 



Monticulipora (Peronopora) molesta. Nicholson, Genus Monticulipora, p. 224, 

 pi. vi, 2-2d, 1881. 



Zoarium irregularly frondescent or sublobate or palmate, 

 rarely submassive; the fronds from 3 to 8 mm. thick, and 30 

 or 40 cm. high and almost as wide. Surface with closely set, 

 rounded, not conical, often slightly elongated, prominent monti- 

 cules, from one to two mm. apart. Apertures subequal, even 

 those on the monticules no larger than the others, polygonal, 

 with thin interspaces, about 10 in 2 mm. Mesopores wanting 



