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Fic. 4.—Disposition of the Fic. 5.—Disposition of Fie. 6.—Disposition of the 
lobes in Amaltheus marga- the lobes in Phylloce- lobes in Phylloceras hetero- 
ritatus, Montf. ras heterophyllum, phyllum, Sow. 
Firstly.—The structure of the lobes and their suture-line 
have been fully studied by Von Bucu, p’OrBieny, QUENSTEDT, 
and Orrrt. I have given a résumé of the descriptions of the 
lobes and ramifications of the margin of the septa in treating 
Fic. 7.—Disposition of the lobes in Fie. 8—Form of the sub-divisions 
Ceratites nodosus, De Haan. of the lobes in Ammonitide. 
Fie. 9.—Mould of the disposition 
of the lobes of Phylloceras. 
