This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 Excerpt: ...but is shorter and with higher beaks. The variety quadrata is a larger, more quadrate shell with 25 to 26 low, rounded ribs. The largest specimen of subtenta is 19 mm. high, 18 mm. wide, and 8 mm. in diameter; the largest specimen of the variety quadrata 28, 27.5, and 18 mm. in the respective dimensions. The small but ...
Read More
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 Excerpt: ...but is shorter and with higher beaks. The variety quadrata is a larger, more quadrate shell with 25 to 26 low, rounded ribs. The largest specimen of subtenta is 19 mm. high, 18 mm. wide, and 8 mm. in diameter; the largest specimen of the variety quadrata 28, 27.5, and 18 mm. in the respective dimensions. The small but constant differences which separate the recent species of this group were also probably characteristic of the Tertiary species, but the condition of the fossils for the most part is so poor that it is difficult to recognize the discriminating factors. By most of the writers on Pacific coast paleontology the species have been indiscriminately lumped together, with each other and with some of the recent forms. A very careful comparison with the recent types indicates that none of the Miocene fossils can be prudently identified with either of the recent species of the coast. Venericardia Castor Dall, n. sp. PI. XI, figs. 1, 3. Shell robust, solid, ventricose, thick, equivalve, inequilateral, with high, full, anteriorly recurved umbones; lunule short, cordate, defined by a deeply impressed line; escutcheon linear or none; ligament stout, seated on well-marked nymphs; sculpture of about 22 feebly defined flattish radial ribs, separated by much narrower, shallow, unchanneled interspaces, the whole crossed by rather rude, close-set, incremental linos; anterior dorsal slope shorter, excavated; posterior longer, convexly arcuate; base evenly rounded; interior smooth, muscular impressions somewhat impressed; margins with broad crenulations corresponding to the sculpture of the exterior. Altitude, 27 nun.; longitude, 25.5 mm.; maximum diameter, 17.0 mm. Figured specimen collected by Arnold one-sixth mile east of East Twin River, Clallam County, Wash.; U....
Read Less
Add this copy of Contributions to the Tertiary Paleontology of the to cart. $34.07, new condition, Sold by Booksplease rated 3.0 out of 5 stars, ships from Southport, MERSEYSIDE, UNITED KINGDOM, published 2018 by HardPress Ltd.
Add this copy of Contributions to the Tertiary Paleontology of the to cart. $40.52, new condition, Sold by Media Smart rated 4.0 out of 5 stars, ships from Hawthorne, CA, UNITED STATES, published 2018 by Sagwan Press.
Add this copy of Contributions to the Tertiary Paleontology of the to cart. $44.29, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2018 by Sagwan Press.
Add this copy of Contributions To The Tertiary Paleontology Of The to cart. $44.81, new condition, Sold by Booksplease rated 3.0 out of 5 stars, ships from Southport, MERSEYSIDE, UNITED KINGDOM, published 2018 by Sagwan Press.
