PLATE II. 

 Lyriopeoten interradiatus. 



Page 44. 



See Plat.- 82. 

 ! \ 5mal] left \ alve. 



Fig, 2. A specimen of lium size, 



Pig. '.i The right valve belonging to the left valve, fig, I. 

 i _ I. The eight valve of fig. •.'. 



Hamilton group. Futtonham, Schoharh Co., N. Y. 



A\ 1TULOPECTEN BELLI •"=. 

 Page 35. 

 See Plate 81. 

 Pig. 5. A small left valve, X 2. 

 Pig 6 A similar left valve, X -• 



Pig, 9. A specimen preserving both valves, showing their comparative form and relations, X - 

 Hamilton group. Near Belkma, N. Y. 



AviCULOPECTEN ORNATTJS. 



Page 37. 

 See Plate 3. 

 Pig. 7. A small specimen preserving both valves slightly displaced, ami the right one imperfect; 

 showing the form and ornamentation, X 2. 



Pig 8. A larger specimen similar to the pre ling, I mt with the surface characters partially obliterated 



from maceration, X 2. 



Hamilton group. Caimndaigua lake, .V. >". 



PTBRtNOPBCTBN ITNDO806. 

 Page 79. 

 See Plate 82. 

 Pig. in A small left valve, >li"«iuu the great proportional length of hinge-line in the young shell. 



Hamilton group. Canandaigua lake, -Y. Y. 

 Pig. II. A large left valve, leaving verj distant equal radii. 



Hamilton group. Bethany, 2V. )*. 

 Pig 12. A right valve, showing numerous concentric undulations. 



Hamilton group, Cwnamaaiguaiake, N. Y. 

 Pig. 13. A light valve preserving two strong undulations in the umbonal region, men' subdued concentric 

 lines lielow, and numerous fine radii. 



C'orniferous limestone. Clarenet HuIIdw, N. 1 

 Pig. 1 1. A right valve preserving a portion of the test on the upper anterior aide and anterior ear. 



Hamilton group. Ca/Mndaiffua Inter. X. Y. 

 Pig. 15. A characteristic right valve. 

 Pig. 16. A large light valve, showing numerous coucentric undulations. 



Hamilton group. Canandaigua lake. If. Y 

 Pig 17. A small specimen preserving both valves and showing strong undulations. 



Hamilton group. Canandaigua lake, X. Y. 

 Pigs. l>. 19. Two nearlj entire large left valves, 



Hamilton group. Gfeneseo, Livingston Co., N. Y. 



