PLATE XLIII. 



f 



GONIOPHORA ACUTA. 

 FHge'295. 

 Figs. 1, 2. Left valve au<i cardinal view. 



Fig. 3. A cardinal view of two valves in conjunction, somewhat compressed. 

 Hamilton group. Shore of Canandaiffua lake, N. T. 



GoNIOl'HOItA RUGOSA. 

 Page 287. 

 See Plate 42. 

 Fig. 4. The left valve of a small indi\-idual. 



Hamilton gixnip. /Shore of Catmndaigua lake, N. Y. 

 Fig. 5. A larg^ 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 gi-oup. Stiore of Catmndaigua lake, N. Y. 

 Fig. 7. A specimen pi-eserving 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 gT-oup. FiiUonham, Schoharie Co., N. Y. 

 Figs. 9-12. A series of young individuals. 



Fig. 13. An imj>erfect right valve preserving a portion of the test and showing the anterior muscular im- 

 pression. 



Hamilton group. Faltonham, Schoharie Co., N. Y. 

 Fig. 14. A right valve in its natural proportions. 



Hamilton group. Bear's &ulf, Schoharie Co., N. Y. 

 Fig. 15. The two valves in conjunction, the right valve pi-eserving its natural foi-m and proportions. 



Hamilton group. Scholiarie Co., N. Y. 

 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. Scholiarie Co., N. Y. 

 Fig. 19. A gfutta-percha impression fi-om the preceding. 



Fig. 20. A cardinal view of two valves in conjiniction, 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 GlAUOUS. 



Page 299. 



See Plate 44. 



Fig. 16. The left side of the specimen partially preserving the shell and showing the anterior muscular 



impression. 



Hamilton group. Shore of Cayuga lake, N. Y. 



