NO. 5 UPPER CAMBRIAN TRILOBITES RESSER I27 



PLATE 18 



PAGE 



Elvinia niontis, new species 94 



I, 2. Dorsal and side views of the holotype cranidium (X i-5)- 

 3, 4. Large exfoliated cranidium. 



Snowy Range formation; (loc. 37r) Warm Spring Creek, Wind River 

 Range, Wyoming. 



Elvinia utahensis, new species 95 



5, 6. Dorsal and side views of the holotype cranidium. 

 St. Charles limestone; (loc. 54e) Blacksmith Fork, Bear River Range, 

 Utah. 



Elvinia ruedemanni, new species 95 



7. Libragene (X i-S)- 



8, 9. Dorsal and side views of the holotype cranidium (X i-S)- 

 10. Small cranidium with Berkeia saratogensis (X i-S)- 



Potsdam sandstone (Theresa member) ; Greenfield, west of Saratoga 

 Springs, New York. 



Elvinia granulata, new species 96 



II, 12. Side and dorsal views of the holotype cranidium (X 2.5). 

 Secret Canyon shale; (loc. 63) northeast of Adams Hill, Eureka Dis- 

 trict, Nevada. 



Elvinia missotiricnsis Resser 96 



13, 14. Nearly complete cranidium. 

 IS, 16. Pygidium. 



17. Libragene. 



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

 Missouri. 



Elvinia gregalis, new species 96 



18, 19. Dorsal and side views of the holotype cranidium (X 2). 

 20, 21. Smaller cranidium (X i-S)- 



22, 23. Pygidium (X i-S)- 



Honey Creek limestone; (loc. gq) Blue Creek Canyon, Wichita Moun- 

 tains, Oklahoma. 



Elvinia longa, new species 97 



24, 25. Side and dorsal views of the holotype cranidium. 

 26, 27. Small cranidium. 



Honey Creek limestone; (loc. 9p) Blue Creek Canyon, Wichita Moun- 

 tains, Oklahoma. 



Elvinia bridgei Resser 97 



28, 29. Squeeze of a pygidium. 



30, 31. A large cranidium, with injury at left anterior angle. (See also 



pi. 19, figs. 1-5.) 

 Honey Creek limestone; (loc. I2p) 4 miles southeast of Hennepin, 



Arbuckle Mountains, Oklahoma. 



