/'// / 



TILTONICERAS COSTATUM 97 c 



Comparable Species 

 29 46 29 29 



Harpoceras acutum ; Wright, 1884, LXXXH, 7, 8— T. 31, 42, 25, 29, 

 .lm. acutus; Denckmann, 1887, x, 2— F. 30, 49, 26, 19. 



