PLATE VIII. 

 Pterixopectex suborbicularis. 



Page 80. 

 S.!e Plates 24 aiul 82. 

 Fig. 1. A nearly entire left valve. The rays are strong-Iy cronulateil in the sperimen ami ilo not bifurcate 

 n.s represented, but increase in number by intei-stitial a'Witidii. 

 Chemung' group. New Albion, Cattaraugux Co., N. Y. 

 ¥\g. 'i. A view of another individual. (The original of fig. 1, p. 264, Geol. Rept. Fourth Dist. N. Y.) 

 Chemung 'group. Holhieville, N. Y. 



Ptekinopectex crenicostatus. 



Page 78. 

 See Plate 82. . 

 Fiji^. H. An im|>i>rfect left valve showing the crenulate rays. 



rhemung- gi-onp. Coruneanrio, N. Y. 

 Fip. 4. A large left valve This specimen is re-ilr.'iwn on plate 82, tig. 14, and represents more fully the 

 form and surface ornamentation. 



Chemung gronj). Angdica, N. Y. 



Pterinopecten Neptunus. 



Page 79. 

 Fig. .5. \ small left valve, imperfect on the post-cardinal margin. 



Chemung group. Phitipsi/urg, N. Y. 

 Fig. fi. A large imperfect left valve. 



Chemung group. Philipsbiirg, N. Y. 

 Fig. 7. An iinpei-fect right valve. The specimen is obscure and is erroneously repi-esented as a left 

 valve. 



Chemimggrou|>. Angeliia, N. Y. 



Lyriopecten magnificos. 



Page.M. 

 Fig. 8. A large left valve obtained from an impression of the matrix. The ligamental area should be 

 represented as longitudinally striate near the beak. 

 Chemung gTOU|). 3Ii»itro,ie. Pii. 



Lyriopecten macrodontus. 



Page 46. 

 See Plate 4. 

 Fig. 0. A left \ahe, incorrectly represented as nearly circular, although in the specimen it corresponds 

 in form with tig. 10. 'Hie ligamentid area is also shown in the specimen. 

 Hamilton group. Hamilton, iV. Y. 

 Fig. 10. A large left valve. The anterior margin is restored in the figure. 

 Hamilton group. Hnmilton, N. Y. 



