126 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO3 



PLATE 17 



PAGE 



Iddingsia anatina, new species 89 



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

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

 tains, Oklahoma. 



Iddingsia simplicitas, new species 89 



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

 5-8. Two other cranidia (X i-5)- 



9. Libragene (X i-s). 



Honey Creek limestone; (loc. 89y) West Timbered Hills, Arbuckle 

 Mountains, Oklahoma. 



Burnetia intermedia, new species 80 



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

 Honey Creek limestone; (loc. i2p) 4 miles southeast of Hennepin, 



Arbuckle Mountains, Oklahoma. 



Burnetia alta, new species 80 



12, 13. Dorsal and side views of the holotype cranidium. 



14. Libragene. 



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

 Missouri. 



Burnetia extensa, new species 81 



15, 16. Partially exfoliated cranidium (X2). 



17, 18. Side and dorsal views of the holotype cranidium (X 1-5 )• 



19. Small cranidium (X4)- 



20. Another cranidium (X3). 



21. Libragene (X2). 



22. Libragene and possible pygidium (X2). 



Honey Creek limestone; (loc. Sgv) West Timbered Hills, Arbuckle 

 Mountains, Oklahoma. 



Burnetia e.vilis, new species 81 



23. Small cranidium (X i-5)- 



24. 25. More complete cranidium (X2). 



26, 27. Side and dorsal views of the holotype cranidium (X l-5)- 

 Honey Creek limestone; (loc. 89V) West Timbered Hills, Arbuckle 

 Mountains, Oklahoma. 



Burnetia curta, new species 83 



28, 29. Side and dorsal views of the holotype cranidium (X2). 

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

 tains, Oklahoma. 



Burnetia cctypa, new species 82 



30, 31. Dorsal and side views of the holotype cranidium. 

 Honey Creek limestone; (loc. 89V) West Timbered Hills, Arbuckle 

 Mountains, Oklahoma. 



Burnetia linyula, new species 82 



32, 22- Side and dorsal views of the holotype cranidium (X i-S)- 

 Honey Creek limestone; (loc. Sgv) West Timbered Hills, Arbuckle 

 Mountains, Oklahoma. 



