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In the Goniatite these foldings of the septa are of a simply lobed or angulated nature, and in the Ammonite Page 213 they are extremely complex; whilst in the Ceratite there is an intermediate state of things, the special feature of which is, that those foldings which are turned towards the mouth of the shell are merely rounded, whereas those which are turned away from the mouth are characteristically toothed.

The venerable Orthoceras and the Goniatite linger on through the epoch and into the first period of the succeeding era.

We have noticed that in the Devonian the sutures of some of the chambered shells become angled, evolving the Goniatite type.

The dorsal position of the siphuncle, however, clearly distinguishes the Goniatite from the Nautilus, and proves it to have belonged to the family of the Ammonites, from which, indeed, some authors do not believe it to be generically distinct.

The Goniatite is another genus, nearly allied to the Ammonite, from which it differs in having the lobes of the septa free from lateral denticulations, or crenatures; so that the outline of these is angular, continuous, and uninterrupted.