PLATE LIX—Continued. 
Grammysia CONSTRICTA. 
Page 377. 
See Plate 78. 
Fig. 13. The right side of a small individual retaining the proper form of the shell. 
Fig. 14. The right valve of another individual, the anterior end shortened by compression in an oblique 
direction. 
Hamilton group. /Shore of /Seneca lake, 2V. Y. 
Fig. 15. A left valve, the anterior end shortened by compression. 
Fig. 16. A right valve retaining the normal form. 
Hamilton group. Schoharie Co., N. Y. 
Fig. 17. A small left valve somewhat shortened anteriorly by compression, the surface preserving a few of 
the radiating strise, enlarged to two diameters. 
Hamilton group. LudlowvUle, N. Y. 
Fig. 18. A cardinal view of a specimen of ordinary dimensions. 
Hamilton group. Shore of Canandaigua lake, N. Y. 
Fig. 19. The right side of a specimen retaining both valves, the anterior end greatly shortened by com¬ 
pression, the surface preserving the radiating strise, enlarged to two diameters. 
Hamilton group. Schoharie Co., N. Y. 
Fig. 20. An enlargement of the surface showing the pustulose character, from the specimen fig. 15 
Grammysia obsoleta. 
Page 366. 
23. Left side, anterior and cardinal views of a specimen which is vertically compressed. 
Hamilton group. Cazenovia, N. Y. 
The interior of a left valve showing the cardinal area and elevation of the umbo. 
Hamilton group. Schoharie Co., N. Y. 
A specimen retaining the two valves in conjunction, each one of which is somewhat narrowed by 
compression. 
A left valve preserving nearly the normal proportions. 
Hamilton group. Pratt's falls, JV. Y. 
A left valve of a specimen somewhat compressed and showing the characteristic fold and sinus 
upon the anterior end of the valve. 
Hamilton group. Schoharie Co., N. Y. 
Figs. 21- 
Fig. 24. 
Fig. 25. 
Fig. 26. 
Fig. 27. 
