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 



