PLATE I. XXX VI II— Continued 



Leiopteria Sati. 



Page 162. 

 I."> An imperfect left valve preserving very fine concentric Lines. 



Hamilton group. Ni lake, N. Y 



I". The left valve of a specim n pre e 'ving b<th valves, sho i stent of the wing and general 



Coini of the shell. 



flaini] i / il -V. Y. 



17. The right valve ofa large specimen with the valves partiallj opened. 

 Han a, .V. Y. 



Pig. 18 A left valve preserving the auricle and wing nearly entire. The hody of the shell has I n subjected 



to pressure and distortion in thi d : nol H present the true form and obliquity. 



Hamilton group. Belloua, N. Y. 

 Fig 1 . 19. An imperfect i fl valve as preserved in a coarse 



Hamilton group. /, I Co., ZV F 



Pig 120 A small : ' c iderabl '■ hosity. 



I familton group. 8 ' ■• . .V. )". 



Leiopteria Gkeeni. 



Page 160 

 See Plate 20. 

 Pig. 21. A large left valve. The figure is restored on the beak and anterior side. 



Hamilton group. BelUma, Totes Go.,- N. Y. 

 Pig 22. An im] Jit valve. 



Hamilton group. Canandaigwa lake, X. Y. 



Leiopteria Bigsbyi. 



Page 1U5. 



See Plate 20. 

 Pig. 23. A small right valve referred to this species. 

 Hamilton group. 3 r . Y. 



Leio pteria Lea i . 

 Page liw. 

 Fig. 24. A small left valve. 



Ki^ r '_'.". A larger imperfect left valve associated with the prec idin ; 

 Hamiltoi SchoTiarit Co., 3". 1". 



Leiopteria M itch elli. 



166 

 See Plate 20. 

 26. A lar . i' imperfect left valve as obtained fi-om the impression of the exterior of the valve in the 

 matrix. 



Hamilton gr mp. S : '■■.. .V. Y. 



Leiopteria Rafinesqcju. 



Page L6I 

 Pig. 'J7. A near! \ entire left valve showing the form and the strong ric undulations. 



Illllu . A . Y. 



Pig. 28 Aright valve referred tot] l'h pecimen is u beak and extremit] of 



the v 



Hamilton group. / li 'le, -V. Y. 



Leiopteria lingueformis. 



Pa 178 



Pig. 29. A left valve, de led of the test, showii leraJ form with the pallia! line and muscular 



impn 



i !hemung group North of I i, A Y. 



