PLANGHE XXIT. 



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



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



Fig. 3. Ophiacantha dilecta, face dorsale. = 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. 



