OCTOBEK, 1841.] Ill Carbonate of Iron, from Cecil county, Maryland. From Dr. Geo. Spackman. Trionyx ferox ? from a stream tributary to Lake Erie, in Monroe county, Michigan. From Dr. G-. C. Leib. Four skulls of the Ottawa tribe of Indians from Michigan. Collected by Dr. Leib, and deposited by Dr. Morton. DONATIONS TO LIBRARY. Lettre sur le Rhopalodon, genre de Saurien fossile du versant occidental de l'oural. Par G-. Fischer de Waldheim. 8vo. St. Petersburg, Russia, 1841. From the Author. Dr. Edward Hallowell read the following paper on a new species of Reptile ; viz. Description of a new species of Chameleon from Western Africa, by Edward Hallowell, M. D. Chamveleo gracilis. Description. Head of moderate size, flat-tened above, depressed in front, presenting upon its upper surface a longitudinal carina, bifurcated anteriorly; each of the divisions resulting from this bifurcation, terminates near the posterior ex-tremity of the supraciliary ridge ; in front of the eye is a ridge continuous with the one above the orbit, extending toward the extremity of the nose. No denticulations are observed upon the supraciliary ridge, on the one just described, nor upon the longitu-dinal carina, or its divisions; but they are very distinct along the superior margin of the temples. A number of small tubercles are seen upon the face, quite near to the extremity of the nose, and also upon the sides of the head in front of the nostril ; a marked concavity exists upon the upper and posterior part of the head, immediately behind the bifurcation of the longitudinal carina ; the space in front comprised between the two branches is perfectly plane ; the head is covered above with polygonal scales of unequal size, and smooth for the most part ; those situated in the depres-sions upen the upper and posterior part of the head are somewhat ^4
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