PLANCHE XXII. 



Fig. I. Ophiacantha procera, face dorsale. G = 8. 



Fig. 2. Ophiacantha procera, face ventrale. G = 8. 



l'^'S- 3- Ophiacantha dilecta, face dorsale. G = 7. 



Fig. 4. Ophiacantha dilecta, face ventrale. G = 7. 



Fig. 5. Astroceras compar, face dorsale. Grandeur naturelle. 



Fig. 6. Astrogomphus munitus, face dorsale. G ^ 6. 



