Rav.mond: Notes on Orhovician 'I'ribolites. 45 



8. Asaphcllus monlicola Raymond. This holotype is from the Tremadoc at 

 the Montagne Noire, Herault, France, Natural size. 



9. Hemigyraspis coUieana Raymond. A jiyKidium from Bcllefonte, Pennsyl- 

 vania. Natural size. 



10. The same species. Another pygidium from the same locaHty. Natural 

 size. 



11. The same species. An imperfect cranidium from the same locality as 

 the last. Natural size. 



12. The same species. A free cheek from the same locality. Twice natural 

 size. 



13. The same species. An hypostoma from the same locality. Natural size* 



14. Symphysnrus convexus (Cleland). From the specimen figured by Weller as 

 IllcBnums Columbiana. Specimen in the collection of the Geological Survey of 

 New Jersej'. Natural size. 



15. 16. Two small pygidia of the same species from Fort Hunter, New York. 

 Natural size. 



17. Symphysnrus sicardi (Bergeron). A specimen from the Tremadoc at the 

 Montagne Noire, Herault, France, for comparison with 5. convexus Natural size. 



