30 
BULLETIN OF THE LABORATORIES 
Kinderhook of 111 . and P. swallovi, from the Chouteau limestone of 
Missouri, but seems quite distinct. 
From nodules in shale at Moot’s run, also in the shales containing 
the same. 
PleuTodictyuin Prohleinaticum, Goldf. 
(Plate VIII, Fig. 15.) 
“ Corallum depressed, sub-hemispherical, or semilenticular ; the 
under side concave and provided with an epitheca, the upper convex. 
Corallites somewhat irregular in size and form, more or less angular, 
often hexagonal, short, increasing rapidly in size and so distinctly ra- 
diating from the middle upwards and outwards, that those of the lower 
series lie nearly or quite parallel to the concave base, and even decline 
as they extend out from near the middle to the periphery — those rising 
from near the middle shorter than the others; connecting pores as in- 
dicated by their casts, rather numerous, and apparently irregularly ar- 
ranged, sometimes passing through the corners as well as the sides of 
the walls between the corallites.” 
A considerable number of this interesting compound coral were 
found by W. F. Cooper, in the upper layers of freestone near congl. 
II, in a condition similar to that described by Meek and Worthen. 
The “coarse, friable sandstone,” referred to the Onondaga section of 
the corniferous group by the Illinois geologists seems to belong at a 
higher horizon as first supposed, at least the presence of the same form 
in the Waverly group, pretty well up in the series, lends probability to 
this suggestion. 
Orbiciiloidea sp? 
(Plate VIII, Fig. 14.) 
A large species of Discina-like appearance is common in the shales 
of the middle Waverly and has been usually referred to D. newberryi. 
Meek. As only the dorsal valve is known and this is larger than the 
type, we prefer to defer identification. There is a ridge rather than a 
slit, as in Discina and the shell is usually distorted. 
