NO. 5 UPPER CAMBRIAN TRILOBITES RESSER II9 



PLATE 10 



PAGE 



Bynumiella typicalis, new species 57 



1. Holotype cranidium (X4)- 



2. A larger cranidium (Xs)- 



Lyell formation; (loc. 66j ) Northeast branch Ranger Brook Canyon, 

 10 miles northwest of Banff, Sawback Range, Alberta. 



Cholopilus (?) albertensis, new species 37 



3. Holotype cranidium (X2). 



Lyell formation; (loc. 64b) Glacier Lake Canyon Valley, 48 miles 

 northwest of Lake Louise, Alberta. 



Talbotina caelata, new species 107 



4. Holotype cranidium (X2.5). 



Nolichucky shale; (loc. 27d) U. S. 11, 7 miles northeast of Rogersville, 

 Tennessee. 



Ellipsocephal aides argutus, new species 63 



5. Imperfect cranidium (X3)- 



6. Holotype cranidium (X4). 



Sabine formation; (loc. 12s) Ram Creek, 15 miles south of Canal Flats, 

 British Columbia. 



Ellipsocephaloides briscoensis, new species 63 



7. Holotype cranidium (X2.5). 



Sabine formation; (loc. 17s) Sabine Mountain, Brisco Range, British 

 Columbia. 



Stenopilus bacca, new species 59 



8. 9. A large cranidium (X2). 



ID, II. Dorsal and side views of a young cranidium (X6). 



12. Partially exfoliated cranidium (X4)- 



13. Holotype cranidium and a smaller example (X3)- 



Signal Mountain formation; (Iocs. i2i, j) 2 miles southwest of Signal 

 Mountain, Wichita Mountains, Oklahoma. 



Stenopilus aduncus, new species 60 



14. 15. Dorsal and side views of the holotype cranidium (X i-S)- 

 16, 17. Partially exfoliated cranidium (Xi-5)- 



Signal Mountain formation; (loc. 12L) Pickens Ranch, Arbuckle 

 Mountains, Oklahoma. 



Bymimina caelata, new species 58 



18-21. Dorsal and side views of two cranidia (X4)- 



22. Holotype cranidium and associated pygidium (X4)- 



Davis formation; (loc. 92d) Federal Lead Mine No. 4, Flat River, 

 Missouri. 



Bynuniina misscniriensis, new species 59 



23, 24. Dorsal and side views of the holotype cranidium (XS)- 



25. Another cranidia (X4)- 



26. Surface with several cranidia (X6). 



Davis formation; (loc. iik) Flat River, Missouri. 



Bynumiella (?) oklahomensis, new species 58 



27. 28. Side and dorsal views of the holotype cranidium (XS)- 

 Signal Mountain formation; (loc. aoij) i mile south of Royer Ranch, 



Arbuckle Mountains, Oklahoma. 



