79/0 



AMMONITES CONVOLUTUS 



i8c 



Comparable Species 



Am. psilnotus plicatus, Quenstedt, 1852, xxvii, 6 ; 1883, i, 13. 

 Arietites semicostulatus ; Wahner, 1886, xxvii, 10-12. 



And see 17c ; but the forward directed ribs (prorsiradii) of 

 A. convolutus are its distinction. 



