PLATE 4. 
CLADOPORA LABIOSA. Middle Devonian. 
1. Front lateral view of the upper fronds of a corallum imbedded in 
rock matrix, from the Falls of the Ohio. Collection of the author. 
LYELLIA DISCOIDEA, Nova Species. Magara. 
2. Convex upper surface of a corallum from the white clay, near Lou- 
isville. Collection of the author. [The example figured is ex- 
quisitely preserved, but its color seems to have prevented good 
photographic delineation. ]} , 
3. Plane upper surface of a corallum, found near Louisville. Collection 
of Dr. J. Knapp. 
LYELLIA PAPILLATA. Niagara. 
4, Lateral view of a weathered corallum showing the vesiculose ccenen- 
chyma, found near Louisville. Collection of the author. 
C@NITES LAMINATA. Niagara. 
5. Upper surface of a weathered corallum from the white clay, near 
Louisville. Collection of the author. 
C@NITES CRASSA. Niagara. 
6. Upper surface of a corallum from the ferruginous clay just below the 
Niagara and Devonian passage-beds, near Louisville. Collection 
of the author. 
