Raymond : Notes on Ordovician Trii.obiies. 7'.> 



5. Ceralocephala narrawayi Raymond. The cranidiuiii ul the uiily specimen 

 known. From McCuUough's sugar-bush at Chazy. New York. About three and 

 one-half times natural size. 



6. Aviphilichas minganensis (Billings). A young individual whose dorsal 

 furrows do not reach the neck-furrow. About three and one-half times natural 

 size. From McCuUough's sugar-bush at Chazy, New York. 



7. Xilcus perkinsi Raymond. The cephalon and part of thorax. This speci- 

 men is from Isle La Motte, and is now in the Vermont State Museum. Holotype. 



8. Nileus perkinsi Raymond. Paratypc in the U. S. National Museum. 

 From Isle La Motte, Vermont. 



9. Glaphiirus pustulaliis (Walcott). A photograph of one of the specimens 

 figured in my previous paper. From Chazy, New York. 



10. The same species. A large entire specimen from Isle La Motte, Vermont. 

 \'crmont State Museum. 



11. The same species. Another of the specimens figured in my previous 

 article. 



12. Ileliomera sol (Billings). A glabella from the lower part of the Chazy 

 at Chcizy, New York. About three and one-half times natural size. Yale Uni- 

 versity Museum. 



13. Nieszkowskia sp. A pygidium from McCuUough's sugar-bush at Chazy, 

 New York. About three and one-half times natural size. 



14. Pliomerops canadensis (Billings). A small specimen from Valcour Island, 



New York. 



Plate XIX. 



1. Basiliciis marginalis (Hall). Avery small and somewhat imperfect cranid- 

 ium from McCuUough's sugar-bush at Chazy, New York. X 4. 



2. The same species. A pygidium from the same locality. X 4- 



3. Isolelus platymarginatus Raymond. A drawing made from the cast of the 

 natural mold shown in figure 3, Plate XVII. X 2. 



4. Isotelus beta Raymond. A pygidium. X 2. 



5. The same species. Pygidium and one thoracic segment. X 2. 



6. 7. The same species. Two free cheeks. X 2. 4 to 7 are from specimens 

 collected at Chazy, New York. 



8. Isoleloides angiisticaudus Raymond. Hypostoma found associated with, 

 and supposed to belong to this species. Natural size. 



9. Bumastus globosus (Billings). Hypostoma supposed to belong to this 

 species. Natural size. Valcour, New York. 



10. Vogdesia bearsi Raymond. A small pygidium. Natural size. 



11. The same species. Side view of a free cheek and eye. Natural size. 



12. The same species. A pygidium, natural size. 10, 11, 12 are from speci- 

 mens collected at Sloop Bay, Valcour Island. 



13. Amphilichas minganensis (Billings). Part of the pleuron of a thoracic 

 segment. X 2. 



14. The same species. A small imperfect cranidium with dorsal furrows which 

 do not meet the neck-ring. X 4. 



15. Ceralocephala narrawayi 'Raymond. The cranidium of the holotype. X 4. 



16. Sphcerocoryphe goodnovi Raymond. A cephalon. X 4. 



