PLATE VIII. 
Pterinopecten suborbicularis. 
Page 80. 
See Plates 24 and 82. 
Fig;. 1. A nearly entire left valve. The rays are strongly crennlated in the specimen and do not bifurcate 
as represented, but increase in number by interstitial addition. 
Chemung group. New Albion, Cattaraugus Co., N. Y. 
Fig. 2. A view of another individual. (The original of fig. 1, p. 264, Geol. Rept. Fourth Dist. N. Y.) 
Chemung'group. Hobbieville, N. Y. 
Pterinopecten crenicostatus. 
Page 78. 
See Plate 82. 
Fig. 3. An imperfect left valve showing the crenulate rays. 
Chemung group. Conewango, N. Y. 
Fig. 4. A large left valve This specimen is re-drawn on plate 82, fig. 14, and represents more fully the 
form and surface ornamentation. 
Chemung group. Angelica, N. Y. 
Pterinopecten Neptunus. 
Page 79. 
Fig. 5. A small left valve, imperfect on the post-cardinal margin. 
Chemung group. Philipsburg, N. Y. 
Fig. 6. A large imperfect left valve. 
Chemung group. Philipsburg, N. Y. 
Fig. 7. An imperfect right valve. The specimen is obscure and is erroneously represented as a left 
valve. 
Chemung g'roup. Angelica, N. Y. 
Lyriopecten magnieicus.' 
Page 51. 
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 group. Montrose, Pa. 
Lyriopecten macrodontus. 
Page 46. 
See Plate 4. 
Fig. 9. A left valve, incorrectly represented ajS nearly circular, although in the specimen it corresponds 
in form with fig. 10. The ligamental area is also shown in the specimen. 
Hamilton group. Hamilton, N. Y. 
Fig. 10. A large left valve. The anterior margin is restored in the figure. 
Hamilton group. Hamilton, N. Y. 
