Palaeontogr. Bd. XIII. 



Taf. Vir 



LS. 



z.c. 



I. üccUaria laticostata. — 2. 0. caucellato. — 3. 0. fimbriata. — 4. 0. expansa. — 5. 0. subtilis. — 6. Ventriculites 

 microporus. — 7, V. reticulatue. — 8. V. tiiberciilosus. — 9. V. costatus. — 10. V. cylindraceus. 



