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. 1915 Excerpt: ...have been recognized and separately described--such as one with a transversely elongate subtriangular marginal outline, or one with periproct midway between margin and peristome--but in each case intermediate forms show a gradation between the possible variety and typical representatives of the species. P. lyelli ...
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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. 1915 Excerpt: ...have been recognized and separately described--such as one with a transversely elongate subtriangular marginal outline, or one with periproct midway between margin and peristome--but in each case intermediate forms show a gradation between the possible variety and typical representatives of the species. P. lyelli Conrad is closely related to the American forms P. pileus-sinensis and P. protuberans, both of which, however, have a relatively higher and more conical central tumid area. P. protuberans is further distinguished by its characteristic swollen anterior interporiferous area and smaller petaloid area. P. lyelli also greatly resembles S. tuomeyi which, however, differs in being somewhat truncated posteriorly and in having its periproct nearer the posterior border. In superficial characters P. lyelli greatly resembles S. mississippiensis, but the latter is easily separated by the inframarginal position of its periproct. It does not appear to be closely related to any of the foreign forms. Localities.--Near Claiborne (Conrad's type and our specimen A); Cedar Creek, Clarke County; St. Stephens, near Cocoa, Choctaw County; and Clarksville, Ala.; Shubuta Creek, 2J miles north of Shubuta; Chickasawhay River, near Shubuta; and Shell Prairie, near Pachuta, Miss.; 14 miles below Macon, Twiggs County, Ga.; Mount Enterprise, Rusk County, and 2 miles east of Alto, Cherokee County, Tex.; Castle Hayne (specimen B); City Rock Quarry, Smith Creek; and Rocky Point, near Wilmington, N. C. Geologic Jwrizon.--Claiborne group (middle Eocene) and Jackson formation (upper Eocene). In Texas in the "marine substage" of the Claiborne. In Mississippi probably near the base of the Lisbon marl. In Alabama abundant in the ScuteUa zone at the base of the Jackson, "jus...
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Add this copy of The Mesozoic and Cenozoic Echinodermata of the United to cart. $41.27, good condition, Sold by Cambridge Rare Books rated 4.0 out of 5 stars, ships from Cambridge, Gloucestershire, UNITED KINGDOM.
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1915. United States Geological Survey. Hard cover. Book-Good, hinges cracked, marks to cover, edges rubbed, wear to spine, gilt titles on spine. 12x9.5. 227pp + 107 b/w plates. This study of the Mesozoic and Cenozoic Echinodermata of the United States was commenced by the senior author of this paper under the auspices of the United States Geological Survey in the autumn of 1890 and was continued until 1915.
Add this copy of The Mesozoic and Cenozoic Echinodermata of the United to cart. $67.74, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2015 by Palala Press.
Add this copy of The Mesozoic and Cenozoic Echinodermata of the United to cart. $90.00, good condition, Sold by de Wit Books rated 4.0 out of 5 stars, ships from Hutchinson, KS, UNITED STATES, published 1915 by Gov't Printing Office.
