NO. 5 UPPER CAMBRIAN TRILOBITES RESSER 125 



PLATE 16 



PAGE 



Berkeia scnlptilis, new species 93 



I, 2. Incomplete cranidium (Xs)- 



3, 4. Side and dorsal views of the holotype cranidium (X3). 

 Honey Creek limestone; (loc. 12k) Honey Creek, 7 miles north of 

 Springer, Wichita Mountains, Oklahoma. 



Berkeia jiicimda, new species 93 



5, 6. Side and dorsal views of the holotype cranidium (X 3)- 

 7-10. Similar views of two other cranidia ( X 3) • 



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

 Missouri. 



Berkeia missonriensis, new species 94 



II, 12. Dorsal and side views of the holotype cranidium (X3)- 

 13, 14. Two larger cranidia (X2). 



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

 Missouri. 



Iddingsia nevadensis, new species 85 



15. The associated libragene. 



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

 Secret Canyon shale; (loc. 61) south of Hamburg Mine, Eureka Dis- 

 trict, Nevada. 



Iddingsia utahensis, new species 85 



18, 19. Side and dorsal views of the holotype cranidium (X i-S)- 



20. Incomplete cranidium (X i-5)- 



Orr formation; (loc. 32t) Fandango Spring Canyon, Dugway Range, 

 Utah. 



Iddingsia missouriensis, new species 86 



21, 22. Dorsal and side views of the holotype cranidium (X2). 



23. Cranidium (X i-5)- 



24, 25. An exfoliated cranidium (X i-S)- 

 26. Libragene. 



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

 Missouri. 



Iddingsia bicincta, new species 87 



27-29. Squeeze, side and dorsal views of holotype cranidium (X i-S)- 

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

 tains, Oklahoma. 



Iddingsia crassimarginata, new species 87 



30-32. Squeeze, dorsal, and side views of holotype cranidium (X i-5)- 

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

 Missouri. 



Iddingsia alpersensis, new species 88 



33, 34. Cranidium (X i-5). 



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

 37, 38. Small cranidium with neck spine (X3)- 



Honey Creek limestone; (loc. I2p) 4 miles east of Alpers, Arbuckle 

 Mountains, Oklahoma. 



Iddingsia (?) qninnensis, new species 88 



39. Holotype cranidium (X i-S)- 



40, 41. Small cranidium (X3). 



Mendha limestone; (loc. 7J ) i mile northwest of Italian Ranch foothills, 

 Quinn Canyon Range, Nevada. 



