70 BihliograpMcal Notices. * Sternum moderately broad, with extended sides of the abdominal plates united to ilie margin by a dentate bony suture. Hinder part of the sternum truncated ; anal plates quadrangular. The pectoral plates quadrangular, nearly as broad in the central line as on the outside. 1. GONIOCHELYS. Stemum trancated in front, without any odd anterior plate ; the shields transverse, parallel. 1. G. carmatum. . 2. Aromochelys. Sternum rounded in front, with a tri-angular odd front shield ; second pair of shields diverging. 1. A. odoratum. ** Sternum broad, attached to the marginal plates by the elongated cartilaginous suture, which becomes more or less bony with age. The hinder j^art of the sternum entire or slightly truncated and notched in the middle ; the anal plates triangular. The anterior and posterior lobes more or less broad and movable on the central portion by a straight mobile suttire. The accillary, and espe-cially the inguincd, plates elongate, covering the sternal costfil suture. The pectoral plates triangular, very narrow in the central line. 3. KiNOSTERNON. The hinder sternal lobe not so broad as tlie cavity of the dorsal shell, leaving the legs exposed at all times. 1. K. pennsylvanicum^ &c. 4. SwANKA. The hinder lobe of the sternum as broad and large as the cavity of the shell, covering the legs when with-drawn. 1. S. i BIBLIOGRAPHICAL NOTICES. First, Second, Third, and Fourth Annual Reports on the Geological Survey of Indiana, made during the years 1869-72. By E. T. Cox, State Geologist, assisted by Messrs. Bradley, Haymond, Levette, Collett, Hobbs, andWAEDEK. In three vols., with two Atlases of Maps. 8vo. Indianapohs, 1869-72. Step by step, and indeed with rapid strides, is the geological sur\'eyor examining the North-American States in detaU, mapping and re-cording the physical features, structure, mineral contents, and pro-ducts of each State, as well as its natural-history characteristics. Indiana, consisting almost wholly of Carboniferous strata, has its limestones, sandstones, fire-clays, ironstones, and coals in abundance, oovered with glacial deposits and alluvium. All of these are being
First, Second, Third, and Fourth Annual Reports on the Geological Survey of Indiana, made during the years 1869–72. By E. T. Cox, State Geologist, assisted by Messrs. Bradley, Haymond, Levette, Collett, Hobbs, and Warder. In three vols., with two Atlases
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