PLATE XXXII 



PAGE 



Figs. 1, 2. CYBTOCERAS BEEKMANENSE Whitfield 330 



1. Lateral view of an incomplete shell, showing septa and living 



chambers. 



2. Ventral view of same specimen. 



Ordovician (Canadian), Beekmantown Is. (Division D. 1), 

 Beekmantown, N. Y. 



Figs. 3, 4. CYBTOCEBAS GBACILE Cleland 329 



Ventral and lateral views of the type. 



Ordovician (Canadian), Tribes Hill Is., Fort Hunter, New 

 York. 



Fig. 5. OBTHOCEBAS PBIMIGENIUM Vanuxem 322 



Natural longitudinal section, illustrating tapering of shell and close- 

 ness of septa. 



Ordovician (Canadian), Beekmantown Is., Beekmantown, 

 New York. 



Figs. 6, 7. CYCLOSTOMICEBAS CASSINENSE (Whitfield) 331 



Lateral and ventral views of a young specimen preserving only the 

 living chamber and several septa. 



Ordovician (Canadian), Beekmantown Is., Cassin beds, Fort 

 Cassin, Vermont. 



Figs. 8-10.. ASAPHELLUS GYBACANTHUS Raymond 345 



8. Pygidium. 



9. Free cheek. 



10. An imperfect cranidium. 



Ordovician (Canadian), Tribes Hill Is., Fort Hunter, New 

 York. 



Figs. 11-15. HEMIGYBASPIS COLLIEANA Raymond 346 



11. An imperfect cranidium. 



12. A free cheek. X 2. 



13. Well preserved pygidium. 



14. An imperfect pygidium. 



15. Hypostoma. 



Ordovician (Canadian), Stonehenge Is., Bellefonte, Pennsyl- 

 vania. 



Figs. 16-18. SYMPHYSUBUS CONVEXUS (Cleland) 347 



16. The cranidium figured by Weller as Illaenurus columMana. 



Ordovician (Canadian), Kittatinny Is., Columbia, New Jersey. 



17. 18. Two small pygidia. 



Ordovician, Tribes Hill Is., Fort Hunter, New York. 



Figs. 19, 20. OOCEBAS KIBBYI (Whitfield) 328 



19. Lateral view of the type. 



20. View of the outer chamber separated from the shell to show depth 



of the septum. 



Ordovician (Canadian), Beekmantown Is. (Division D. 1), 

 Beekmantown, New York. 



Figs. 1, 2, 5, 19, 20 are after Whitfield; 6, 7 after Ruedemann; 

 3, 4 after Cleland; and 8, 18 after Raymond. 



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