XII LIST OF ILLUSTKATIONS 



New fossil fresh-water mollusks from Florida 



By William B. Marshall 



Facing page 

 1. Fossil fresh-water shells from Florida 4 



A CLASSIFICATION OF THE TOOTHLIKE FOSSILS, CONODONTS, WITH DESCRIP- 

 TIONS OF American Devonian and Mississippian species 



By E. O. Ulrich and R. S. Bassler 



1- 6. American Devonian conodonts 64 



7-10. American Mississippian conodonts 64 



11. Teeth and dermal plates of recent fishes 64 



Termites collected on the Mulford Biological Exploration to the 



Amazon Basin, 1921-22 



By Thomas E. Snyder 



1. Soldiers of Rhinoternies, Cornitermes, and Cylindrotermes 76 



2. Soldiers of NasHtitermes, Syntermes, and Spinitermes 76 



3. Soldiers of Diversitermes, Tennirostritermes, and Velocitermes 76 



A NEW nematode from the rat and its life history 



By Eloise B. Cram 



1-2. Protospirura colnnihiana, new species 8 



The Nearctic budworms of the lepidopterous genus Heliothis 



By S. E. Crumb 



1. Larval characters of gemis Heliothis 8 



The minerals of Obsidian Cliff, Yexlowstone National Park, and 



their origin 



By William F. Foshag 



1-4. The minerals of Obsidian Cliff 18 



Revision of the Ambhiican Leaf hoppers of the Jassid OEa^us Typh- 



locyba 



By W. L. McAfee - 



1. Tegmina of Typhlocyba 48 



2-6. Genitalia of TyphJocyha 48 



