582 The University Science Bulletin. 



PLATE LX. 



1. Ventral view of female genitalia. 



2. Lateral view of ventral valve. 



3. Lateral view of lateral valve. 



4. Rodlike structure found on ventral valve. 



5. Ventral view of dorsal valves and lateral valve. 



6. Dorsal view of female genitalia. 



