Index 
493 
Orthodesma prolatum, sp. nov 
Orthodesma pulaskiensis, sp. nov 
Orthorhynchula linneyi, James 
Over-population, types of 
Over-population, what is? 
Owen, Edgar W. “Influence of glaciation on agriculture in Ohio.’’ 
Pacific coast states in last decade.. 
Peristomial plates 
Pholadomorpha chambliensis, sp. nov 
Pholadomorpha pholadiformis, Hall 
Pholadomorpha pholadiformis — divaricata 
Pholidops subtruncata, Hall 
Plectambonites curdsvillensis, sp. nov 
Plectambonites plicatellus, Ulrich 
Plectambonites rugosa, Meek 
Plectorthis fissicosta, Hall 
“Population centers and density of population in Ohio.” By F. Carney. . . 
Population centers, factors in the location and growth of 
Pottsville formation 
Precipitation, quantity of, in Ohio 
Precipitation, seasonal distribution in Ohio 
Proetus chambliensis, sp. nov 
“Pro-glacial lake shorelines of the Bellevue quadrangle, Ohio.” By F. 
Carney 
Psiloconcha sinuata — borealis, var. nov 
Psiloconcha subovalis, Ulrich 
Pterotheca cf . attenuata, Hall 
Pterotheca pentagona, sp. nov 
Rafinesquina declivis, James 
Rafinesquina mucronata, sp. nov 
Rafinesquina nasuta, Conrad 
Rafinesquina squamula, U. P. James 
Railroads and population centers 
Rhytimya oehana, Ulrich 
Ruedemann, Dr. Rudolph, referred to 250, 251, 255, 312, 
Ruedemannia abbreviata, Hall 
Rural density (in Ohio), limit of 
Sardenson, Prof. F. W., referred to 
ScHUCHERT, referred to 35, 
Settlements, early, in Ohio 
Sewage disposal and urban density (in Ohio) 
Southall, Edith M. “A geographical interpretation of Cincinnati, 
Ohio.” ' 
Stark county, Ohio, referred to 
Streptaster, floor plates of 
Streptaster, Hall, generic characteristics 
Streptaster, reversal of curvature in 
Streptaster reversata. sp. nov 
289 
288 
132 
184 
183 
390 
185 
414 
281 
277 
279 
256 
122 
122 
123 
130 
175 
176 
390 
194 
194 
320 
231 
296 
295 
312 
313 
127 
265 
263 
264 
179 
307 
318 
311 
186 
46 
135 
176 
190 
2 
390 
420 
450 
405 
451 
