PLATE I. 



1. Reconstructed arm of a broken specimen, No. 7, with part of the adjacent arm and the summit 



of their primary radials, ^ 6 . 



2. First branch, seen from above. 



3. Second branch, seen from above. 



4. Third branch, seen from above 



f>. Parts of arm seen in profile between the first and second branches. 



6. Part of arm seen in profile between the second and third branches. 



7. Part of arm near middle of last branch, seen in profile. 



