19W 



AMMONITES EXORTUS 



19c 



Comparable Species 



Am. raricostatus, Zieten, 1831, xiii, 4. 



Echioceras raricostatum ; Bayle, 1878, LXXVii, 2, 3. 



Am. raricostatus microdiscus, Quenstedt, 1884, xxiv, 6. 



