124 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I03 



PLATE 15 



PAGE 



Pteroccpltaliiia pcH/o)iipc)isis, new species 78 



1. Cranidium and holotype pygidium (X^). 



2. Side view of tlie holotype (X 2). 



Secret Canyon shale ; west side of Pogonip Mountain, White Pine 

 District, Nevada. 



Pterocephalina grata, new species 78 



3. 4. Cranidium (X 3)-. 



5, 6. Side and dorsal views of the holotype pygidium (X2). 

 Secret Canyon shale; (loc. 23b) ridge east of Hamburg Ridge, Eureka 

 District, Nevada. 



Pterocephalina utahensis, new species 79 



7. Large pygidium (X i-S)- 



8, 9. Cranidium (X2). 



10, II. Dorsal and side views of the holotype pygidium (X2). 

 Orr formation; (loc. 33d) east side Fish Spring Range, Utah. 



Coosia iridentensis, new species 74 



12. Small pygidium (X i-S)- 



13. Cranidia and pygidium (X i-S)- 



14. 15. Holotype cranidium (X i-5)- 



16. Incomplete cranidium (X i-S)- 



17. Impression of pygidium (X i-S)- 



Pilgrim formation; (loc. 2oy) 3 miles north of Trident, Montana. 



Berkeia comes, new species 90 



18. 19. Incomplete cranidium (X3)- 



20, 21. Dorsal and side views of the holotype cranidium (X3)- 

 Deadwood formation ; (loc. 88a) Deadwood, Black Hills, South Dakota. 



Berkeia saratogensis, new species 91 



22, 23. Side and dorsal views of the holotype cranidium. (22, X i-5; 



23, X 3-) 

 24, 25. Two cranidia (X i-5)- 

 Potsdam sandstone ; Greenfield, northwest of Saratoga, New York. 



Berkeia nevadcnsis, new species qi 



26. Holotype cranidium (X2.5). 



27. Cranidium (X2.5). 



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

 District, Nevada. 



Berkeia retusa, new species 92 



28. 29. Side and dorsal views of the holotype cranidium (X3)- 



30. Cranidium (X3)- 



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

 Arbuckle Mountains, Oklahoma. 



Berkeia zifichitaensis, new species 92 



31, 32. Side and dorsal views of the holotype cranidium (XS)- 



33. Pygidium (X3). 



Honey Creek limestone; (loc. 91L) Big Baldy, Wichita Mountains, 

 Oklahoma. 



Berkeia angustata, new species 93 



34, 35- Side and dorsal views of the holotype cranidium (X3)- 

 36-39. Two cranidia (X3)- 



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

 Mountains, Oklahoma. 



