PLATE XV. 



a, face of axillary leading to left fork. c , keel of the distal face of the axillary. 



b, face of axillary leading to the main branch, pn, insertion of pinnule. 



1 . Syzygy face of hypozygial below the second fork. 



2. Proximal face of same joint. 



3. Syzygy face of epizygial from the same part of the arm. 



4. Distal face of same. 



5. Distal face of next joint. 



6 First axillary, seen from below. 



7. Same seen from above, somewhat obliquely. 



8. Same seen facing the distal extremity. 



!i Same seen facing the distal face, b, leading to the right fork. 



10. Same seen facing the distal face, a, leading to the left fork. 



11. Distal face of first joint of left fork. 



12 Proximal face of same joint, fitting against face b of Fig. 6. 



