PLATE 71 



Acidaspis sp. undet 

 Page 262. 

 Fig. 1. View of an incomplete cephalon. 



Proetus conradi Hall 



Page 263. 



Fig. 2. View showing the glabella and the marginal border. 



Proetus cf. pachydermatus Barrett 



Page 263 



Fig. 3. View of an incomplete cephalon. 



Proetus protuberans Hall 

 Page 263. 

 Figs. 4-6. Three pygidia of different sizes. 

 Fig. 7. View of a glabella with portions of the cheeks. 



Ltchas .sp 

 Page 264. 

 Figs. 8, 9. Two fragments of the test of a large lichad. 

 Dalmanites cf. aspinosus Weller 

 Page 265. 

 Figs. 10, 11. Two incomplete pygidia. 



Dalmanites cf. bisignatus Clarke 

 Page 265. 

 Fig. 12. View of an incomplete pygidium. 



Ceratolichas gryps Hall 

 Page 264 

 Figs. 13, 14. Front and dorsal views of a nearly complete cranidium from the Grand 



Tower limestone of Illinois. 

 Fig. 15. Glabella of larger specimen from the Little Saline limestone. 

 Dalmanites cf. pleuroptyx (Green) 

 Page 266. 

 Fig. 16. View of an incomplete pygidium. 



Dalmanites cf stemmatus var. convergent Clarke 

 Page 267. 

 Fig. 17. View of a nearly complete pygidium. 



Dalmanites sp. 

 Page 267. 

 Fig. 18. Anterior margin of the cephalon. 



Dalmanites praenuntia sp. nov. 

 Page 267. 

 Fig. 19. View of pygidium showing the slightly bilobed posterior margin. 



Dalmanites slocomi sp. nov. 

 Page 266. 

 Fig. 20. View of a nearly complete pygidium. 



Cryphaeiis sp. 

 Page 268 

 Fig. 21. View of a nearly complete pygidium with the spines broken off. 



Dalmanites micrurus? (Green) 

 Page 266. 

 Fig. 22. Incomplete cephalon showing the tuberculate surface. 



Phacops cristata Hall 

 Page 268. 

 Fig. 23. Dorsal view of a large cephalon. 



Figs. 24, 25. Dorsal view of a cephalon and an incomplete pygidium. 



Phacops sp. 

 Page 269. 

 Fig. 26. A nearly complete pygidium. 



