FOSSILS 



401 



Plate IV. American Devonian Fossils 



1. Heliophyllum Halli, 1/2. 2. Acervularia Davidsoni, 1/2. 3. Spirifera pen- 

 nata, 3/4. 4. Athyris spiriferoides, 3/4. 5. Rhynchonella contracta, 5/4. 6. Pteri- 

 nea flabella, 1/2. 7. Conocardium trigonale, 3/4. 8. Euomphalus Decervi, 1/3. 

 9. Gomphoceras mitra, 1/6. 10. Goniatites Vanuxemi, 1/3. 11. Homalonotus 

 Dekayi, 1/3. 12. Phacops rana, 1/2. (Figs. 1, 2 after Rominger. 3-7, 9-12 after 

 Hall. 8 after Meek.) 

 2 D 



