. Bulletin - New York State Museum. Science. Chonetes billingsi C. m u c r o n a t u s Hall, there is a natural similarity of expression extending even to the interior characters of the brachial valve, but the distinctive differences of C. billingsi consist in its gib- bosity, angulated front margin at maturity, stronger, coarser and more uniformly simple ribs. In respect to these characters in all the shells they are the most pronounced in that before us and be- come progressively decreased in the upward range of the group, so that it serves the purposes not only of paleontologic but also of
. Bulletin - New York State Museum. Science. Chonetes billingsi C. m u c r o n a t u s Hall, there is a natural similarity of expression extending even to the interior characters of the brachial valve, but the distinctive differences of C. billingsi consist in its gib- bosity, angulated front margin at maturity, stronger, coarser and more uniformly simple ribs. In respect to these characters in all the shells they are the most pronounced in that before us and be- come progressively decreased in the upward range of the group, so that it serves the purposes not only of paleontologic but also of geographic distinction to recognize distinctively this early manifes- tation of features which are less pronounced in C. laticosta of the Onondaga limestone and still further diminished in C. mucronatus of the Marcellus and Hamilton. Dimensions. A full sized example has a width on the hinge of 13 mm. and a length of 11 mm. From this the size ranges downward to a length of 2 mm. Lozver Devonic. Grande Greve, P. Q. Middle Devonic. Gaspe Basin, P. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New York State Museum; New York State Museum. Albany : New York State Education Dept
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
