PLATE it. 



RING SHAPES AND POSITIONS; VOLVA SHAPES. 



FIG. 1. RING SUPERIOR, BROAD. 



2. RING MEDIAL, PENDULOUS. 



3. RING INFERIOR (low down). 



4. RING NARROW, FRAGMENTS APPENDICU- 



LATE. 



5. RING FIBRILLOSE. 



FIG. 6. RING PERSISTENT, SOMETIMES MOVABLE. 



7. VOLVA FREE. 



8. VOLVA SEPARATING, CIRCUMSCTSSILE. 



9. VOLVA IRREGULARLY, CIRCUMSCISSILE. 



10. VOLVA FRIABLE, DISAPPEARING. 



