158 



PALEONTOLOGY 



FIG. 46. APERTURAL MARGINS OF CEPHALOPODA. 



a, a', Phylloceras mediterraneum Neumayr, Vesulian, near Digne (Basses 

 Alpes). (x.) Showing rostrum and lappets (unusual in Phyllocera- 

 tidce] and a number of varices, only parallel to apertural margin if 



