. Acadian geology [microform] : the geological structure, organic remains and mineral resources of Nova Scotia, New Brunswick and Prince Edward Island. Geology; Paleontology; Geology; Geology; Geologie; Paléontologie; Géologie; Géologie. â IvH FT- t ' ^ tt 1^ f i â ' 656 THE LOWER Sn>URIAN PERIOD. parallel to the margin. This groove widens at the point where it bends to go forward along the sides, in such a way as to encroach on and thin out the marginal fold, and, just before reaching the anterior margin, it narrows itself from the inner side so as to cause the lateral lobes to widen so
. Acadian geology [microform] : the geological structure, organic remains and mineral resources of Nova Scotia, New Brunswick and Prince Edward Island. Geology; Paleontology; Geology; Geology; Geologie; Paléontologie; Géologie; Géologie. â IvH FT- t ' ^ tt 1^ f i â ' 656 THE LOWER Sn>URIAN PERIOD. parallel to the margin. This groove widens at the point where it bends to go forward along the sides, in such a way as to encroach on and thin out the marginal fold, and, just before reaching the anterior margin, it narrows itself from the inner side so as to cause the lateral lobes to widen somewhat anteriorly. These are narrow, flattened, about half as wide as the middle lobe, narrowing to a point just behind the middle lobe where they do not unite. The medial lobe is about five-sixths of length of pygidium, shield-shaped, flattened, convex, more elevated than the lateral lobe. Its anterior border is slightly concave in the middle. The lateral angles are rounded, and the lobe is contracted a little anteriorly. It is bounded by two deep and well-marked furrows, which join one another in the middle of the marginal furrow, forming a pointed arch.* Medial lobe projecting farther forwards than the lateral ones. A little .spine is situated on its mesial line about one-fourth its length from front. Surface smooth. The pygidium and cephalic shield, from which the above descriptions were drawn up, were collected by my father and myself at St John, near the residence of W. II. Burtis, Esq., from shales of the lower part of the Acadian group. They were associated with Conoce- phalites Baileyi and C. Matthewi, Oi'this Billingsi, etc. The two pai*ts are separate, and each is represented by but a single specimen. I have little hesitancy in referring the one to the other. The glabella seems to be marked by a broad but faint transverse depres- sion just behind the anterior glabella furrow. There are indistinct traces of an anterior articulating border to the pygidium. Both
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Keywords: ., boo, bookcentury1800, booksubjectgeology, booksubjectpaleontology
