. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. 5 ^6 Figs. 5 and 6. Lateral and superior views of centrum of distal caudal. (No. 585.) One half natural size. the material upon which was based Marsh's description oi Plcuroccelus montaniis. These western forms may, however, be specifically distinct from the Maryland species. Synonymy of Pleuroccelus nanus Marsh and Astrodon JOHNSTONI LeIDY. It now remains to discuss the synonymy of the above-mentioned genera and species. The generic name of Astrodon was given without description in the Ameri
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. 5 ^6 Figs. 5 and 6. Lateral and superior views of centrum of distal caudal. (No. 585.) One half natural size. the material upon which was based Marsh's description oi Plcuroccelus montaniis. These western forms may, however, be specifically distinct from the Maryland species. Synonymy of Pleuroccelus nanus Marsh and Astrodon JOHNSTONI LeIDY. It now remains to discuss the synonymy of the above-mentioned genera and species. The generic name of Astrodon was given without description in the American Journal of Dental Science, 1859, by Dr. Christopher Johns- ton to certain reptilian teeth obtained by a Mr. Tyson from a bed of iron ore near Bladensburg, Maryland. In 1^6'^,' as, Astrodon Jo/mstoni, Dr. Leidy fully described and fig- ured these teeth, thus placing the genus on a valid foundation. A comparison of Dr. Leidy's figures of the teeth of Astrodon johnstoni with Marsh's figures of Pleurocadus nanus will show a very striking similarity between the two, which is rendered all the more striking by an actual comparison of the s}>ecimens themselves. Moreover since I myself collected all of the material described and figured by Professor Marsh I can assert that it likewise was found in a bed of iron ore near Bladensburg, Maryland. The exact locality of the Marsh material was certain iron ore mines on the farm of Mr. Wm. Coffin, and especially in that one locally known as " Swampoodle " and situated about one and one half miles northeast of Beltsville on the Baltimore and Ohio Railway, some thirteen miles from \\'ashington. Since these remains ^ Memoir on the extinct Reptiles of the Cretaceous formations of the United States, Smith, Contr. to Knowl., Vol. 14, PI. XIII, figs. 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 n
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