PLATE LXXXIX 



PAGE} 



Fig. 1. PROETUS PACHYDERMATUS Barrett 489 



Portion of cephalon preserving glabella. X 2. Helderberg formation, 

 Keyser member, Cumberland. 



Figs. 2-4. PROETUS CF. PROTUBERANS Hall 490 



2. Cephalon. 



3. The pygidium of another individual. 



4. Profile of the same. 



Coeymans formation, New York. 



Figs. 5, 6. CORDANIA CYCLURUS Hall and Clarke 491 



5. Fragment of cephalon showing lateral furrows of the glabella a 



little too strongly. X 3. 



6. Pygidium showing ornamentation. X 3. 



New Scotland formation, New York. 



Figs. 7, 8. CYATHASPIS AUSTRALIS Ohern n. sp 492 



Two views of the type. X 3. Helderberg formation, Cumberland. 



Fig. 9. CALYMENE CAMERATA Conrad 494 



Pygidium, exfoliated. Helderberg formation, Keyser member, Pinto. 



Figs. 10-12. HOMALONOTUS SWARTZI Ohern n. sp 495 



10, 11. Detached pleura?. 

 12. Glabella. 



Oriskany formation, Ridgely member, Millers Spring near 

 Cumberland. 



Figs. 13-15. HOMALONOTUS VANUXEMI Hall 496 



13, 14. Views of pygidium. 

 15. Nearly complete cephalon. 



Oriskany formation, Ridgely member, Franklin, W. Va. 



