The Canadian journal of industry, science and art . Pig. 130. MINERALS AKD GEOLOGY OF CANADA. 21 the vertebral column of a fish. Weathered specimens of this kind areusually described by quarrymen and farmers as fish remains ; but novestiges of a true fish, or other vetebrated type, have as yet been dis-covered in our Silurian strata. In the third sub-genus, for which, without regard to the supposi-tion originally involved in the term, Prof. Halls name of Endocerasmay be retained, we may place the orthoceratites with very large andlaterally-situated or more or less marginal siphuncle. Endoceras
The Canadian journal of industry, science and art . Pig. 130. MINERALS AKD GEOLOGY OF CANADA. 21 the vertebral column of a fish. Weathered specimens of this kind areusually described by quarrymen and farmers as fish remains ; but novestiges of a true fish, or other vetebrated type, have as yet been dis-covered in our Silurian strata. In the third sub-genus, for which, without regard to the supposi-tion originally involved in the term, Prof. Halls name of Endocerasmay be retained, we may place the orthoceratites with very large andlaterally-situated or more or less marginal siphuncle. Endocerasproteiforme, of Hall, (), is a familiar Cana-dian example. The si-phuncle, in this species,often contains a long coneof calcareous matter, madeup of successive secretion probablyserved to counterbalancethe increasing buoyancy ofthe shell, as the air-cham-bers during the growth ofthe latter became moreand more numerous. Theshells of smaller orthocer-atites are also sometimesfound, with other acciden-tal bodies, in the interiorof
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