476 REVIEWS 



elevation of the Cincinnati axis began in Middle Silurian this still 

 remains to be proved. There is ample proof of local elevations in 

 various parts of Indiana, Kentucky, and Ohio, but not of any connec- 

 tion between these elevations and the formation of the Cincinnati axis. 

 .... The result of all my investigations for the last five years in Ohio, 

 Kentucky, and Indiana have tended to confirm the conclusion that at 

 the close of the Upper Silurian a considerable part of the folding which 

 now constitutes the Cincinnati axis took place ; that a period of 

 denudation took place, removing most strata from the axis of this fold, 

 and proportionally smaller amounts from its flanks ; and that the 

 Devonian rests unconformably upon the denuded Upper Silurian rocks 

 upon the flanks of the axis, and that it rests upon Lower Silurian upon 

 the middle portions of this axis." 



J. A. Price (pp. 81-143, with map) outlines the distribution of the 

 Waldron shale (Upper Niagara) through Decatur, Rush, Shelby, and 

 Bartholomew counties, and gives numerous detailed sections covering 

 the Devonian-Silurian parting. The name Hartsville limestone is 

 proposed for a bed of limestone ranging up to ten feet in thickness, 

 lying between the Waldron shale and the Devonian limestone. It is 

 considered to be Silurian in age and as probably the equivalent of the 

 Louisville limestone of Foerste. An interesting case of postglacial 

 stream diversion is noted in the northwestern part of Decatur county. 

 Flat Rock and Little Flat Rock creeks, flowing in southwesterly 

 directions through old valleys, join near Downeyville and flow west 

 through a narrow valley. From near the junction an old col extends 

 to the present valley of Clifty Creek, near Milford. The glacial and 

 preglacial course of the two branches of Flat Rock was through this 

 old col and down Clifty Creek. Later they were diverted into the 

 present valley of Flat Rock. 



E. B. Williamson (pp. 229-333, P^ s - I-VII) on the Dragonflies of 

 Indiana, gives keys for their identification, directions for collecting and 

 preserving, and descriptions of those species known to occur in the 

 state. 



R. E. Call (pp. 335-536, pis. I-LXXVII) contributes a most com- 

 plete and well-illustrated descriptive catalogue of the mollusca of 

 Indiana, including bibliography, keys, and notes on the habits and dis- 

 tribution of all forms found in the state. 



W. S. Blatchley (pp. 537-552) in a brief paper describes the 

 batrachians and reptiles of Vigo county. 



