PLATE XLIII. 
Goniophora acuta. 
Page 295. 
Figs. 1, 2. Left valve and cardinal view. 
Fig. 3. A cardinal view of two valves in conjunction, somewhat compressed. 
Hamilton group. Shove of Canandaigua lake, N. Y. 
Goniophora rugosa. 
Page 297. 
See Plate 42. 
Fig. 4. The left valve of a small individual. 
Hamilton group. Shore of Canandaigiia lake, N. Y. 
Fig. 5. A large left valve in its natural form and proportions. 
Hamilton group. Shore of Cayuga lake, N. Y. 
Fig. 6. A left valve more produced anteriorly than the preceding. 
Hamilton group. Shore of Canandaigua lake, N. Y. 
Fig. 7. A specimen preserving the two valves in conjunction. 
Hamilton group. Schoharie Co., N. Y. 
Goniophora Hamiltonensis. 
Page 296. 
Fig. 8. A right valve below the medium size. 
Hamilton group. Fultonham, Schoharie Co., N. Y. 
Figs. 9-12. A series of young individuals. 
Fig. 13. An imperfect right valve preserving a portion of the test and showing the anterior muscular im¬ 
pression. 
Hamilton group. Fultonham, Schoharie Co., N. Y. 
Fig. 14. A right valve in its natural proportions. 
Hamilton group. Bear's Gulf, Schoharie Co., N. Y. 
Fig. 15. The two valves in conjunction, the right valve preserving its natural form and proportions. 
Hamilton group. Schoharie Co., N. F. 
Fig. 17. A cardinal view of a specimen preserving both valves. 
Hamilton group. Schoharie Co., N. Y. 
Fig. 18. A partial cast of a large right valve, showing the imprint of the hinge area. 
Hamilton group. Schoharie Co., N. Y. 
Fig. 19. A gutta-percha impression from the preceding. 
Fig. 20. A cardinal view of two valves in conjunction, which are somewhat narrowed by compression. 
Fig. 21. A cardinal view of two valves conjoined by the ligament. The specimen is vertically compressed 
and the cardinal slope flattened. 
Goniophora Glaucus. 
Page 299. 
See Plate 44. 
Fig. 1(5. The left side of the specimen partially preserving the shell and showing the anterior muscular 
impression. 
Hamilton group. Shore of Cayuga lake, N. Y. 
