PLATE 96. 



AuLACOPHYLLUM MUTABiLE, Nov. Spec. Devonian. 



1. Left lateral view of a weathered corallum. 



2. View of central-gap side and posterior portion of the calyx of a 



coralluui, indicating the formation of the calyx floor. 



3. Right lateral view of a corallum with anterior wall broken down. 



4. Posterior view of a corallum. 



5. Oblique lateral view of a badly weathered corallum, whose lamellae 



were incrassated by the process of fossilization. 



6. Front, or central-gap view of a corallum with anterior wall fortui- 



tously removed, showing the sub-cellulose structure of the wall. 



7. View of the calyx of a corallum (prone), showing a secondary 



calyx of cystose structure. 



8. 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. 



