INDEX 
383 
Sevier Shales^ Giles County, Va 339 
Sex-Linked Inheritance 11 
Shenandoah Limestone, Giles County, Va 321 
Smooth Orthoconic Canadian Caphalopods 200 
“Some Problems of Taxonomy/’ By A. W. Lindsey 289 
Species Concept 290 
Specific Gravity, Differences in : 176 
Spyroceras 225 
Spyroceras microtextile 87 
Stabilization of Genera 300 
Straparollus (?) pervetustus 57 
Stringed Instruments with Bow 33 
Fingerboards 32 
Strophonella daytonensis 91 
hanoverensis 90 
milleri 106 
Subspecific Divisions 293 
Tertiary Gravels, Giles County, Va 357 
“The Egg and Larva of Hesperia Juba Bdv.” By A. W. Lindsey 121 
“The Meander Patterns of Rios Secure and Mamore, Eastern Bolivia.” 
By Kirtley F. Mather 22 
“The Occultation of Venus by the Moon on January 13, 1923.” By P. 
Biefeld 127 
“The Underground Migration of Oil and Gas.” By Kirtley F. Mather 155 
“Trichoptilus Pygmaeus Wlsm and The Neuration of the Family 
Pterophoridae.” By A. W. Lindsey 187 
Tripteroceras 231 
Tripteroceras hastatum 232 
pauquettense 233 
Underground Water, Movements of; nature of the movement 178 
Westenoceras 253 
Whirlpool Sandstone of Ontario, The Fauna of 50 
Whitfieldella cf. cataractensis 92 
cf. ovoides 76 
circularis 53 
