333 
[Foerste. 
Ohio. It consists of broad horizontal sheets, often 11 mm. thick 
near the centre, gradually decreasing in size towards the extrem- 
ities, often continuing for some distance with a thickness of less 
than 3 mm. In the specimen described a layer 11 mm. thick near 
the centre, at the periphery 100 mm. off is 1 mm. thick. On the 
surface of these sheets knobs are formed by the irregular growth 
of the zoarium. Sometimes this increased activity in growth takes 
another form and instead of knobs being formed the zoarium grows 
rapidly along some line horizontally until a new layer is formed 
which continues to grow rapidly horizontally and vertically until a 
new sheet is formed entirely covering the old one but often separ- 
ated from the same everywhere excepting along the line of origin. 
In this wa} r a zoarium may come in time to consist of five or 
six layers or sheets. The visceral tubes are small, .6 to .75 mm. 
wide and occur on the average at a rate of five in a length of 8 
mm. The visceral tubes are circular and form little pits on the 
surface crenulated by twelve marginal septa. Between the visce- 
ral tubes are numerous minute tubes, of which ten are found in a 
length of 2 mm. The visceral tubes are crossed by horizontal dia- 
phragms. Our specimens are more readily compared among Amer- 
ican forms with the species as figured by W. J. Davis, from the 
Niagara near Louisville, than with Rominger’s forms from Drum- 
mond’s Island, Michigan, or Masonville, Iowa. 
Fayosites favosus, Goldfuss. 
A single specimen was found at Collinsville, Alabama, a cast of 
the tubes, best comparable in size with fig. 4, pi. iv, of Rominger’s 
Fossil Corals. The tubes are polygonal, unequally pentagonal or 
hexagonal, having an average diameter of 3 mm. The fragment is 
40 mm. long and 30 mm. broad, and evidently belonged to a large 
massive specimen. 
At Fair Haven, Ohio, was found a specimen of the same varie- 
ty, showing the crenulated walls of the tubes, and horizontal dia- 
phragms at the rate of about ten in 10 mm. 
At Brown’s quarry, west of New Carlisle, another species of the 
same variety was found. 
Favosites fayosideus, Hall. 
At the Soldiers’ Home near Dayton, Ohio, is found a small sub- 
spheroidal form of Favosites , usually not over 35 mm. in diameter, 
