PLATE XCVII 1 



PAGE 



Figs. 1-4. KLCEDENIA CENTRICORNIS Ulrich and Bassler 529 



1. Lateral view of left valve (female individual) broken anteriorly. 



X 20. 



2. Left valve of a complete carapace. X 20. 



3. 4. Posterior and ventral views of same specimen. X 20. 



Figs. 5-7. KLCEDENIA FIMBRIATA Ulrich and Bassler 529 



5. Lateral view of a perfect left valve. X 20. 



6, 7. Ventral and end views of same specimen. X 20. 



Coeymans formation, Herkimer County, New York. 



Figs. 8, 9. LEPEKDITIA ALTOIOES Weller 513 



8. Left valve. X 2^. 



9. Right valve. X 2%. 



Decker Ferry formation, Flatbrookville, New Jersey. 



Fig. 10. LEPERDITIA GIGANTEA Weller 514 



A left valve, natural size. Rondout formation, Nearpass Quarry, New 

 Jersey. 



Fig. 11. LEPERDITIA ELONGATA Weller 514 



A right valve. X 2. Rondout formation, Nearpass Quarry, New 

 Jersey. 



Figs. 12, 13. KLCEDENIA NEARPASSI (Weller) 530 



Left and right valves. X 6. Decker Ferry formation, Nearpass Quarry, 

 New Jersey. 



Figs. 14, 15. KLCKDENIA SUSSEXENSIS (Weller) 532 



Two left valves showing slight variations. X 4 and X 6. Decker 

 Ferry formation, Nearpass Quarry, New Jersey. 



Fig. 16. KLCEDENIA KUMMELI (Weller) 531 



A left valve. X 3. Rondout formation, Nearpass Quarry, New Jersey. 



Fig. 17. KLCEDENIA BARRETTI (Weller) 532 



A right valve. X 5. Decker Ferry formation, Nearpass Quarry, New 

 Jersey. 



Figs. 18-20. KLCEDENELLA PENNSYLVANIA (Jones) 533 



Left side, end and ventral views of a complete carapace. X 15. Helder- 

 berg formation, Pennsylvania. 



Fig. 21. KLCEDENELLA CLARKEI (Jones) 533 



Right valve. X 20. Helderberg formation, Herkimer County, New 

 York. 



'Figs. 8-17 (after Weller), Figs. 18-21 (after Jones). 



