CONTENTS. 



Number 297. 



Page 

 Louis Valentine Pirsson (with Portrait) 173 



Art. XIV. — Origin of Rock Tanks and Charcos ; by K. Bryan 188 



Art. XV. — New Species of Oligocene (White River) Felicias; 



by M. R. Thorpe 207 



Art. XVI. — Some Minerals of the Melanterite and Chalcan- 

 thite Groups with optical data on the hydrous sulphates 

 of manganese and cobalt; by E. S. Larsen and M. L. 

 Glenn 225 



Art. XVII. — An Upper Carboniferous Footprint from Attle- 



boro, Massachusetts; by R. S. Lull 234 



SCIENTIFIC INTELLIGENCE. 



Geology — Topographic Maps and Sketch Mapping, J. K. Finch : The Porto 

 Eico Earthquake of 1918 ; Eeport of the Earthquake Investigation Com- 

 mission, H. F. Eeid and S. Taber, 238. — Scientific Survey of Porto Eico 

 and the Virgin Islands : La Fauna Jurassica de Vinales, M. S. Eotg ; Mary- 

 land Geological Survey, Cambrian and Ordovician, E. S. Bassler, 237. — 

 Handbuch der Palasogeographie, T. Arldt : The Geology of East Texas, 

 E. T. Dumble : Pleistocene Marine Submergence of the Hudson. Champ- 

 lain and St. Lawrence Valleys, H. L. Fairchild : Eeport of the State 

 Geologist on the Mineral Industries and Geology of Vermont, 1917-1918, 

 G. H. Perkins, et al., 238. — Geology and Natural Resources of Rutherford 

 County, Tennessee, J. J. Galloway : Geologic Map of Ohio, J. A. Bow- 

 nocker: Seasonal Deposition in Aqueo-glacial Sediments. R. W. Sayles : 

 Middle Cambrian Algas and Middle Cambrian Spongise, C. D. Walcott. 

 239. — On the Structure of Eusthenopteron, W. L. Bryant : Upper Cre- 

 taceous Floras of the eastern Gulf Eegion in Tennessee, Mississippi, 

 Alabama, and Georgia, E. W. Berry : Some American Jurassic Ammon- 

 ites of the Genera Quenstedticeras, Cardioceras, and Amceboceras, 

 Family Cardioceratidas, J. B. Eeeside, Jr., 240.— Paleontological Cor- 

 relation of the Fredericksburg and Washita Formations in North Texas, 

 W. S. Adkins and W. M. Minton : Fossils from the Miura Peninsula and 

 its immediate north, M. Yokoyama : North American Early Tertiary 

 Bryozoa, F. Canu and E. S. Bassler. 241. — A Monograph of the Naiades 

 of Pennsylvania. Part III, Systematic Account of the Genera and Species, 

 A. R. Ortmann, 242. 



