160 
GEOLOGY OF THE FOURTH DISTRICT. 
63 
1. Cyathophyllum. 2. Cyathophyllum dianthus. 3. Syringopora. 
1. Cyathophyllum? It is impossible to pronounce with certainty whether this be a Cya¬ 
thophyllum or Strombodes, as I have had no opportunity of examining its internal structure. 
It is one among the common and abundant forms of the Onondaga limestone occurring with 
C. flexuosum and C. ceratites. 
2. Cyathophyllum dianthus. (Goldfuss, Petref. p. 54, pi. xv, fig. 13, and pi. xvi, fig. 1. 
Silurian Researches, p. 690, pi. 16, f. 12, 12 a to 12 e.) This coral usually appears in large 
groups, which, from their silicified condition, stand out in relief on the surface of the rock. 
The figure is a small portion from a mass of this kind, of the natural size. 
Localities —Caledonia, Livingston county, Williamsville, Le Roy, &c. 
3. Syringopora. This fossil often appears as in the specimen standing out in relief upon 
the surface ; at other times the ends of the coral are seen projecting, showing their structure 
in the most'perfect manner. 
There are also two or three other species which are abundant in this rock. The one 
figured apparently differs from any species of Goldfuss. 
The characteristic fossils of the Onondaga limestone in the Third District, figured by Mr. 
Vanuxem on page 132 of his Report, cannot be considered as typical of this rock in the 
Fourth District. The Pentamerus elongatus occurs at Vienna, but I have not seen it else¬ 
where in the district. 
