EXPLANATION OF PLATE XXXVIII. 



Figs. 1-5. Group of Beyrichia linnarssoni (= subgenus Steusloffia.) 



1. Left valve of Beyrichia (Steusloffia) linnarssoni (Krause), X 20. 



2. Left valve of Beyrichia (Steusloffia) antiqua (Steusloff), X 20. 



3. Eight valve of Beyrichia (Steusloffia) simplex (Krause), X 15. 



4. Left valve of Beyrichia (Steusloffia) acuta (Krause), X 20. 



5. Left valve of Beyrichia (Steusloffia) signata (Krause), X 10. 

 Figure 2 is copied from Steusloff; the rest are after Krause. 



0-11. Group of Beyrichia interrupta. 



G. Right valve of Beyrichia interrupta (Jones), X 20. 



7. Left valve of Beyrichia granulifcra, new name, proposed for Bollia 



granulosa Krause, preoccupied in the genus Beyrichia, X 15. 

 S. Left valve of Beyrichia v-scripta Krause, X 15. 

 0-11. Left and right valves and dorsal edge view of the complete carapace 

 of Beyrichia damesi Krause, X 15. 

 Figure 6 is copied from Jones, while 7 to 11 are from Krause. 

 12,13. K laden ia initial is (Ulrich). 



Side and ventral edge views of a right valve, X 20. (After Ulrich.) 



14. Klcedenia icilckensiana (Jones). 



Right valve of female individual, X 8. (After Jones.) 



15. Klcedenia prcenuntia, new species. 

 Right valve, X 10. 



Ordovician (Hermitage). 4 miles south of Carthage, Tennessee. 



16. Klcedenia marginalis, new species. 

 A right valve, X 10. 



Helderbergian, Dalhousie, New Brunswick. 



17. Klcedenia punctillosa, new species. 

 Lateral view of a right valve, X 10. 

 Helderbergian, Dalhousie, New Brunswick. 



18. Klcedenia retifera, new species. 

 Left valve, X 10. 



Helderbergian, Dalhousie, New Brunswick. 

 10,20. Klcedenia sussexensis (Weller). 

 Two left valves, X 10. 

 Helderbergian, Dalhousie, New Brunswick. 



21. Klcedenia manliensis (Weller). 



Left valve of a female individual, X 10. This specimen agrees fairly 

 well with Weller's description and figures of his Beyrichia 

 manliensis from Manlius of New Jersey, except in the apparently 

 less development of the border. The surface is very finely punctate. 



Helderbergian, Dalhousie, New Brunswick. 



22. Klcedenia fimbriata, new species. 

 Left valve, X 20. 



Coeymans limestone, Herkimer County. New York. 



23. Klcedenia centricomis, new species. 

 Left valve of a female individual. X 20. 

 Coeymans limestone, Cumberland. Maryland. 



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