328 
INDEX 
Orthoceras sp 3O5 
with vertical color bands 212 
Parallelodus obliqua 206 
Parastrophia hemiplicata 19S 
Platystrophia shepardi 199 
Platymerella manniensis 223 
Potash, Inorganic sources of 37 
Organic sources of 41 
Proetus undulostriatus 219 
Protocycloceras cf, lamarcki 270 
lamarcki 269 
• whitfieldi 270 
‘'Psychological Factors in Vocational Guidance.” By Thomas A. Lewis. .. 147 
Pterygometropus cf. lincolnensis 220 
Rafinesquina deltoidea 200 
Remopleurides missouriensis ; 220 
“Revolution vs. Evolution: The Paleontologist Renders His Verdict.” By 
Kirtley F. Mather 307 
Rhynchotrema rowleyi 201 
Schizocrania filosa 202 
Schuchertia magna 26 
“Some Factors in the Geographic Distribution of Petroleum.” By Maurice 
G. Mehl 55 
“Some Suggested Experiments for the Graphic Recording of Speech Vibra- 
tions.” By Robert James Kellogg 83 
“Some Suggestions for Indicating Drilling Operations.” By Maurice G. 
Mehl , 169 
Sonograph, description of 93 
Sonoscope, description of 91 
Spermatocyte Chromosomes of Anisolabis maritima Bon 240 
Springee, Frank. “Additional Notes on Brassfield Echinodermata” 81 
Spyroceras bilineatum 213 
Stasfurt Deposits 34 
Stereoaster squamosus 28 
Strophomena cf . incurvato 202 
Structure Models, advantages of 164 
the construction of 162 
Tetradium fibratum 194 
“The Importance of Drainage Area in Estimating the Possibilities of Petro- 
leum Production from an Anticlinal Structure.” By Kirtley F. Mather 
and Maurice G. Mehl 143 
