The Mississippian Brachiopoda of the Mississippi Valley Basin volume 1

Cover The Mississippian Brachiopoda of the Mississippi Valley Basin volume 1
The Mississippian Brachiopoda of the Mississippi Valley Basin volume 1
Stuart Weller
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And 7. 5 mm. , height of cardinal area 3. 5 mm. And 3. 5 mm. The dimensions of a brachial valve are : length 16 mm. , width along the hinge-line 38 mm. , convexity 6. 5 mm.
S18 MISSISSIPPIAN BRACHIOPODA Pedicle valve most convex posterior to. The middle, the surface curving abruptly from the umbonal region to the cardinal margin on each side of the beak, curving more gently to the antero-lateral margins and becoming compressed towards the cardinal extremities; beak small, pointed, moderately in
...curved; cardinal area of moderate height, arched, the curvature slight in the inferior portion, becoming stronger towards the beak, lateral margins sharply defined, sloping from the beak to the cardinal extremities, the slope becoming more abrupt distally, surface marked by vertical lines, the hinge-margin minutely creriulate, the delthyrium large, broadly triangular; lateral slopes convex towards the middle of the valve, becoming compressed towards the cardinal extremities, each marked by from 16 to 20 depressed rounded plications which grow successively fainter towards the cardinal extremities, in those individuals with excessively elongate hinge-lines becoming nearly or quite obsolete distally, the first one or two plications on each side of the sinus bifurcate close to the beak, the remaining ones are simple ; mesial sinus shallow, rounded in the bottom, defined to the beak, be- coming less sharply defined anteriorly, marked by a median plication which originates near the beak and passes to the anterior margin either as a simple plication or bifurcating near the middle of the valve, on each side are one, or more rarely two, plications which originate from the inner margin of the bounding plications.

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