112 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO3 



PLATE 3 



PAGE 



Irvinyclla ohloiuia, new species 17 



1-3. Dorsal, side, and front views of the holotype cranidium (X2.5). 

 Wilherns formation; (loc. 70) Baldy Mountain, 8 miles northwest of 

 Burnet, Texas. 



IrvincjcUa agrcstis, new species 17 



4-6. Dorsal, front, and side views of the holotype cranidium (X2.5). 

 Wilberns formation; (loc. 69) Honey Creek, 8 miles southeast of Llano, 

 Texas. 



Iri'ingella ardvwrcnsis, new species 18 



7-9. Dorsal, side, and front views of the holotype cranidium (X i-5). 

 10-12. Another partially exfoliated cranidium (X i-5)- 

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

 Mountains, Oklahoma. 



Irviugella plena, new species 18 



13-15. Dorsal, side, and front views of the holotype cranidium (X 1-5). 

 Wilberns formation; (loc. 14b) Cold Creek, opposite north end of 

 Sponge Mountain, San Saba County, Texas. 



IrvimjcUa alto, new species 19 



16-18. Dorsal, side, and front views of the holotype cranidium (X i-5). 

 Honey Creek limestone; (loc. 9p) 15 miles northwest of Fort Sill, 

 Wichita Mountains, Oklahoma. 



Irviiujclla dcckcri, new species 19 



19-21. Views of a small cranidium (X2.5). 

 22-24. A larger cranidium (X i-S). 



25-27. Front, side, and dorsal views of the holotype cranidium (X 3)- 

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

 Mountains, Oklahoma. 



Irinngella bimictciisis, new species 20 



28-30. Front, dorsal, and side views of the holotype cranidium (X i-S)- 

 31-33. Dorsal and side views of two cranidia on one base, and front 



view of the upper specimen (X 2). 

 Wilberns formation; (loc. 70) Baldy Mountain, 8 miles northwest of 

 Burnet, Texas. 



IrvingcUa hacca, new species 20 



34-36. Dorsal, side, and front views of the holotype cranidium (X 2.5). 

 Wilberns formation; (loc. 14b) Cold Creek Canyon, opposite north 

 end of Sponge Mountain, San Saba County, Texas. 



IrvingcUa accincta, new species 21 



37-39- Front, side, and dorsal views of the holotype cranidium (X 2.5). 

 Wilberns formation; (loc. 14b) Cold Creek Canyon, opposite north end 

 of Sponge Mountain, San Saba County, Texas. 



IrvingcUa abrnpta, new species 21 



40-42. Dorsal, side, and front views of the holotype cranidium (X 1-5). 

 43-45. A smaller cranidium (X2.5). 



Wilberns formation; (loc. 14b) Cold Creek Canyon, opposite north end 

 of Sponge Mountain, San Saba County, Texas. 



IrvingcUa media, new species 22 



46-48. Side, front, and dorsal views of the holotype cranidium (X5)- 



49-51. Another excellent specimen (X 5)- 



Wilberns formation; (loc. 70) Baldy Mountain, 8 miles northwest of 



Burnet, Texas. 

 52-54. Dorsal, front, and profile views of a larger cranidium (X3). 

 Wilberns formation; (loc. 14b) Cold Creek, opposite nortii end of 

 Sponge Mountain, San Saba County, Texas. 



