66 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 98 



PAGE 

 Tonkinclla idahoensis, new species 45 



10. Holotype pygidium (X 4). 



Alokistocare euchare, new species 51 



11, 12. Holotype cranidium (X 1.5). 



Alokislocarella occidens, new species 52 



13, 14. Holotype cranidium (X2). 

 Poulsenia occidens, new species 59 



15. Holotype cranidium (X4). 



Agnostus lautiis, new species 25 



16. Cranidia and pygidium (X5). 



17. 18. Other pygidia (XS). 



Plate 3 



Oryctocephalites typicalis, new species 45 



1. Small cranidium (X4). 



2. Holotype cranidium (XS). 



3. A large cranidium (X 5)- 

 4-6. Pygidia (X4)- 



Oryctocephahis maladcnsis, new species 45 



7. Only fragment of pygidium discovered (X 1-5). 



8. Well-preserved holotype cranidium (X4). 



9. Large cranidium (X4)- 



Prozacanthoidcs alatus, new species 26 



10. Holotype cranidium (X2.5). 



11. Large pygidium (X4). 



12. Small pygidium (X5)- 



Prozacanthoidcs libertyensis, new species 27 



13. Cranidium doubtfully referred to the species (X 3). 



14. Cranidium (X2.5). 



15. Squeeze of holotype pygidium (X 2.5). 



Prozacanthoidcs decorosus, new species 27 



16. Holotype cranidium (X2). 



17. Pygidium (X2). 



18. Hypostoma and cranidium (X 2). 



Prozacanthoidcs c.vilis, new species ■ 28 



19. Pygidium (X 2). 



20. Holotype cranidium (X 3)- 



Prozacanthoidcs acquits, new species 28 



21. Holotype cranidium (X2). 



22. Cranidium (X2.5). 



23. Pygidium (X 4)- 



Prozacanthoidcs optatus, new species 29 



24. Impression of holotype showing intragenal spine (X 3). 



25. 26. Holotype cephalon with thoracic segments (X3)- 



27. Cranidium (X4). 



28. Cranidium (X2.5). 



29. Pygidium (X 4)- 



30. Cranidium and hypostoma (X3)- 



