. A contribution to American thalassography : Three cruises of the United States Coast and geodetic survey steamer "Blake", in the gulf of Mexico, in the Caribbean sea, and along the Atlantic coast of the United States, from 1877 to 1880. Blake (Steamer); Marine animals -- Atlantic Ocean; Marine sediments. Fig. :•]-:!. Pourtalesia miranda. Fig. 374. The study of that species, Pourtalesia miranda (Fig. 374), showed affinities to a singular family of urchins described from the chalk, as well as extended relationship to types considered as long extinct. The Ananchytidse, to which the Po
. A contribution to American thalassography : Three cruises of the United States Coast and geodetic survey steamer "Blake", in the gulf of Mexico, in the Caribbean sea, and along the Atlantic coast of the United States, from 1877 to 1880. Blake (Steamer); Marine animals -- Atlantic Ocean; Marine sediments. Fig. :•]-:!. Pourtalesia miranda. Fig. 374. The study of that species, Pourtalesia miranda (Fig. 374), showed affinities to a singular family of urchins described from the chalk, as well as extended relationship to types considered as long extinct. The Ananchytidse, to which the Pourtalesiee are allied, are perhaps the most typical cretaceous sea-urchins. They all have large coronal plates, recalling the Echini, with a disconnected apical system characteristic of many cainozoic spa- tangoids ; they have a sunken anal system, some of them a most remarkable anal beak, and a very striking pouch, in which the mouth is placed. They possess rudimentary fascicles, and their. Fig. 375. — Urechinus 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 Agassiz, Alexander, 1835-1910; U. S. Coast and Geodetic Survey. Boston ; New York : Houghton, Mifflin and Co.
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Keywords: ., bookauthoruscoasta, bookcentury1800, bookdecade1880, bookyear1888
