PLATE XIV. 



pn, point of attachment of pinnule. 



1. View from below of arm joint near the middle of the arm above the third fork, showing insertion 



of pinnule. 



2. Proximal face of same. 



3. Distal face of same. 



4. Proximal face of hypozygial of same part of arm. 



5. Syzygy face of same joint. 



6. Lateral view of joint from first fork of arm, seen facing canal of pinnule. 



7. Oblique view of same, showing pit of pinnule. 



8. Distal face of same joint. 



9. Proximal face of arm joint from first fork of arm. 



10. Joint below axillary of second fork, distal face. 



11. Axillary of second fork, seen from above. 



12. Distal face of same joint, showing the two openings of the axial canal leading into the forks. 



