PLATE 96, 
AULACOPHYLLUM MUTABILE, Nov. Spec. Devonian. 
1 
2. 
3. 
i 
Left lateral view of a weathered corallum. 
View of central-gap side and posterior portion of the calyx of a 
corallum, indicating the formation of the calyx floor. 
Right lateral view of a corallum with anterior wall broken down. 
Posterior view of a corallum. 
- Oblique lateral view of a badly weathered corallum, whose lamelle 
were incrassated by the process of fossilization. 
Front, or central-gap view of a corallum with anterior wall fortui- 
tously removed, showing the sub-cellulose structure of the wall. 
View of the calyx of a corallum (prone), showing: a secondary 
calyx of cystose structure. 
Anterior view of a corallum in which the secondary calyx is lami- 
nated. 
Specimens 1-6 are found in the Middle Devonian red clay, near 
Louisville. : 
Specimens 7 and 8 are found in the Middle Devonian blue clay, 
Falls of the Ohio. 
The examples figured belong to the collection of the author. 
