Notes on Cincinnatian Fossil Types 
299 
same host, and which interfere more or less at their points of con- 
tact. The specimens usually are incrusting on shells or other fos- 
sils. The type, by far the largest specimen known at present, is 
attached to the exterior of a large Cameroceras, 60 millimeters wide 
and 110 millimeters long. The thickness of the incrustation varies 
from less than a millimeter to fully 3 millimeters. The short ridges 
and irregular agglomerations noted above are regarded as the most 
characteristic feature of this species when typically developed, but 
in younger specimens these are not conspicuous and the coarser 
size of the papillae is depended upon to distinguish it from Derma- 
tostroma papillatum and D. scabrum. All specimens of Derma- 
tostroma glyptum found so far occurred in the Whitewater member 
of the Richmond. 
12. Stromatocerium granulosum, James 
{Plate I, Fig. 1) 
1865. Stenopora huronensis Billings {part), Geol. Surv. Canada, Pal. Foss., 1, p. 
185 
1875. Alveolites granulosus James, Cat. Foss. Cincinnati Group, p. 2 
1883. Tetradium huronense Foord {part), Contr. Canadian Cambro-Sil. Micropal, 
p. 25, Plate 7, Figs. 1, la 
1885. Labechia ohioensis Nicholson, Mon. British Strom., p. 32, Plate 1, Figs. 1, 2 
1910. Stromatocerium huronense Parks, Univ. Toronto Studies, Geol. Series, No. 
7, p. 20, Plate 22, Figs. U-IO, Plate 23, Fig. 5 
A specimen of Tetradium encrusted with a thick growth of 
Stromatocerium served as the type of Stenopora huronensis, and 
the specimen was described by Billings as though the papillae on 
the surface of the Stromatocerium were the terminations of the tubu- 
lar corallites of the Tetradium. However, almost the entire descrip- 
tion evidently is based upon the Stromatocerium. Foord redescribed 
the same specimen under the name Tetradium huronense. It is 
evident that he also regarded the surface features of the Stromato- 
cerium as surface features of the Tetradium, and while he recognized 
the structure of the tubules at the center of the specimen as that of 
Tetradium, he did not differentiate that of the encrusting organism 
as Stromatocerium. In the meantime, however, James had de- 
scribed the same species from another locality, without any con- 
fusion of Stromatocerium and Tetradium, as Alveolites granulosus. 
The specimen described by Billings and Foord was obtained from 
the lower part of those strata on Manitoulin island, at Cape Smith, 
which correspond approximately with the Whitewater member 
