335 
[Foerste. 
Favosites venustus Hall. 
At Collinsville, Alabama, numerous specimens of a species are 
found, casts of the tubes having very much the same size as those 
figured by Rominger in his Fossil Corals, pi. v, fig. 3. The tubes 
are irregularly hexagonal, and have an average diameter of 1 mm. 
The original form of the specimens, judging from the fragments, 
seems to have been irregularly spheroidal, the specimens having a 
diameter of perhaps 40 mm. It is just as possible that the speci- 
mens may have been much larger. 
In one specimen the casts have preserved the position of the rows 
of spiniform processes, so that the casts appear as cylindrical bod- 
ies deeply furrowed all around by sharp grooves. At first sight 
they suggest rather some species of Lyellia or Heliolites with but lit- 
tle space between the tubes of the polyps. 
At Ludlow Falls, Ohio, the normal species with tubes 1 mm. in di- 
ameter occurs, the tubes showing the sharp spiniform crenulations, 
and frequent diaphragms. 
At Ludlow Falls occurs also a form in broad, flat or hemispher- 
ical radiated masses, in which the tubes vary from 1.2 mm. to .6 
mm. in different parts of the same zoarium. Pieces from the more 
finely tubed portion, and young specimens look very much like 
Favosites discus , W. J. Davis. But until the descriptions of that 
species are published we are in no position to judge as to their 
identity. The walls not infrequently show crenulations but we have 
been unsuccessful in finding the spiniform crenulations of Favo- 
sites venustus. The diaphragms are also much farther removed 
than is usual in that species, five diaphragms occupying a length 
of from 2.4 to 3.2 mm. 
This species is found at Fair Haven. At the same locality 
forms are also found having tubes 1.3 mm. and less in diameter, 
with five diaphragms in 1.9 mm., and the walls scarcely crenulated. 
The species is also represented from the Clinton of Yellow Springs, 
Ohio, in the Columbia College Cabinet. All of these forms can 
readily be placed under F. venustus if the size of the tubes be made 
a criterion, but if the possession of spiniform crenulations be con- 
sidered the chief specific feature, then most of the forms described 
here, especially those with distant diaphragms, may belong to some 
new species. We suspect that the spines may not always be pre- 
served in fossil forms even if present originally. 
