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Psammodus porosus. Orthoceras. In the mountain limestone we see, of course, the predominance of marine types, encrinital remains forming the greater proportion of the mass. There are occasional plant remains which bear evidence of having drifted for some distance from the shore. But next to the encrinites, the corals are the most important and persistent.
The magnificence of your last numbers, eight and nine, cannot be told. How admirably executed are your Macropoma, the Ophiopris procerus, Mantell's great beast, the minute details of the Dercetis, Psammodus,. . .the skeletons. . . There is nothing like it in all that we possess upon vertebrates.
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. Psammodus porosus, Agassiz. Bone-bed, Mountain Limestone. Cochliodus contortus, Agassiz. Bone-bed, Mountain Limestone.
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