PLATE XVII. 



CORALS 1?110M THE MIDDLK LIAS. 



Fig. 



1. Montlivaltia Victoria, Duncan. Nat. size. A corallmn, witli a constriction near 



the calice. (P. 63.) 



2. A magnified view of some septal (external) ends, with endotheca^ simulating costae 



and exotheca. The epitheca is shown covering these structures. 



3. A specimen with a large calice. 



4. A calice slightly magnified. The rudimentary septa are shown as faint white lines 



close to the thin margin. 



5. Diagram of the septa. 



6. Slightly magnified view of the thin epithecal wall and the curved endotheca. 



8. > Different forms of the species. 

 9.) 

 10. A septum, magnified. 



I 



