PLATE VIII. 



Pterinopectev SUBORBICULAIMS. 



Page 80. 



See Plates 24 and 82. 



Pig. I. A nearlj entire 1 • • t't valve. The rays are strongly crenulated in the specimen and '\<> not bifurcate 



as represiMiti-d. but increase in number l>\ interstitial addition. 

 Chemung group. New Albion, Cattaraugus Co., N. Y. 

 Fig, ';. A view of another individual. (The original of iig. 1, p. 264, Geol. Rept. Fourth Dist. N. V.) 

 Chemung'group. HobbievWe, N. Y. 



Pterinopecten crenicostatus. 



Page 78. 

 See Plate 82. . 



Pig. :!. An imperfect left valve showing the crenulate rays. 

 Chemung group. Conewango, X. Y. 

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

 form .-11111 surface ornamentation. 



Chemung group. Angelica, N. Y. 



Pterinopecten Neptuni S. 



Page 79. 

 Pig. ">. A small left val\e, iuipi i - 1 "■ ■ • t i >!! the post-cardinal margin. 



Chemung- group. Philipsbiu-y, N. Y. 

 Pig. i'<. 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 

 vah e. 



Chemung group. Angelica, N. Y. 



Ltriopecten magnificus. 



Page 51. 



Pig. 8. A large left valve obtai 1 from an impression of the matrix. 'The ligamental area should be 



represented as longitudinally striate near the beak. 

 Chemung group. Montrose, Pa. 



Ltriopecten macrodontus. 



Page 4G. 



See Plate 4. 

 Pig. 9. A left valve, incorrectly represented as 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, .V, V. 

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

 Hamilton group. Hamilton, X Y 



