PLATE LXXXIV. 



ACTINOPTERrA ZETA. 

 Page 123. 

 See Plate 23. 

 Fig. 1. A large left valve of this species. 



Fig. 2. A smaller example preserving the surface ornamentation. 

 Chemung group. Ithaca, N. Y. 



ACTINOPTEBIA PUSILLA. 

 Page 117. 

 Fig. 3. A right valve of this species. 



Hamilton group. Caimndaigua lake, N. Y. 



ACTINOPTERIA DECUSSATA. 



Page 111. 

 See Plates 17, 18 and 20. 

 Fig. 4. An enlargement of the surface of the specimen fig. 13, plate 18, showing the characters on another 

 portion of the shell than i-epresented in fig. 14 of the same plate. 

 Hamilton group. Western N. Y. 



ACTIXOPTERIA TENUISTRIATA. 



Page 120. 

 Fig. .'). A left valve showing the usual characters. 



Fig. 6. An enlargement of the surface from another specimen showing the regular coarse rays with finer 

 rays between. 



Chemung group. Ithaca, N. Y. 



ACTINOPTEKIA IOTA. 



Page 127. 

 Fig. 7. An imperfect left valve. 



Chemung group. Ithaca, N. Y. 



ACTINOPTERIA ETA. 

 Page 121. 

 Fig. 8. A left valve as obtained from an impression of the matrix, showing the characters of the surface. 

 Fig. 9. A small left valve. 



Fig. 10. A right valve of this species, showing the form and character of the surface. 



Fig. 11. A left valve of medium size, somewhat narrowed by pressure, showng the cai-dinal expansions 

 and surface markings. 



Chemung group. Ithaca, N. Y. 



ACTINOPTERIA PEUSTKIALIS. 



Page 118. 

 See Plate 23. 

 Fig. 12. A right valve referred to this species. 



Chemung group. Ithaca, N. Y. 



ACTINOPTERIA KAPPA. 



Page 128. 

 Fig. 13. A left valve. 



Chemung group. Ithaca, N. Y. 



ACTINOPTERIA PEROBLIQUA. 



Page 116. 



See Plate 19. 



Fig. 14. The left valve of the specimen fig. 31, plate 19, showing the pallia! line and muscular impi-ession 



with several umbonal scars. 



Hamilton group. Cazenovla, N. Y. 



