X ILLUSTRATIONS 



Facing page 



3. Tuzoia from British Columbia and Manchuria 18 



4. Burgess shale crustiicea 18 



5. Lower Cambrian Crustacea 18 



6-7. Lower and Middle Cambrian Crustacea 18 



The Bbyozoan fauna ov the GALAPAoris Islands 



By Ferdinand Cauu and Ray S. Bassler 



1-14. Bryozoa of GalapagOKS Islands 62-75 



The Middle Devonian Traveesej group op rocks in Michigan. A 



SUMMARY OF EXISTING KNOWLEIDGE 



By Erv/in R. Puhl 



1. Locations of sections from which the complete sequence of Traverse 



beds in the Traverse Bay district may be derived 34 



2. Geological section at Bay View railroad station 34 



Oolites or cave pearls in the Carlsbad Caverns 

 By Frank L. Hess 



1. Cave pearls from Carlsbad Criverns, Nev/ Mexico 6 



2. Sections of spherical cave pearls from Carlsbad Caverns, New Mexico- 6 



3. Sections of Oolitic sand from Great Salt Lake, Utah 6 



4. Phosphate rock from Wyoming showing Oolitic structure 6 



5. Elongated cave pearl from Carlsbad Caverns, New Mexico, and section 



of an Oolite of nickel 6 



6. Specimens showing concentric structure 6 



7. Cave pearls from Carlsbad Caverns, New Mexico 6 



8. Cave pearls from Carlsbad Caverns, New Mexico 6 



Contribution to the taxonomy op Asiatic wasps op the genus 

 Tipiiia (Scoliidae) 



By H. W. Allen and H. A. Jaynes 



1-i. Wasps of the genus Tiphia 104 



Two new mollusks of the genera Ostrea and Exogyra from the 

 Austin chalk, Texas 



By Lloyd W. Stephenson 



1. A new species of fossil oyster from Texas 6 



2. A new species of fossil oyster from Texas 6 



3. A new species of Exogyra with color markings preserved 6 



The Foraminifera of the Ripley formation on Coon Creeik, 



Tennessee 



By Willard Berry and Louis Kelley 

 1-3. Foraminifera of the Ripley formation 18-20 



