PLATE XLII. 



GONIOPIIORA PERANGULATA. 

 Page 293. 

 See Plate 34. 

 Fig. 1 . The right side of a small specimen preserving the test and surface markings. 

 Fig. 2. A cardinal view of a left valve showing the posterior muscular scar, the furrows left by its reces- 

 sion from the beak, and the convexity of the valve. 

 Schoharie giit. Schoharie, N. Y. 



GONIOPHORA ? ALATA. 



Page 294. 



See Plate 34. 



Fig. 3. A large right valve, somewhat crushed along the umbonal I'idge and preserving some of the 



stronger concentric striae. 



Schoharie grit. Schoharie, N. Y. 



GONIOPHORA MINOR. 



Page 305. 

 Fig. 4. A right valve. _ 



Figs. 5, 6. Left valves showing some variation in form. 



Chemung group. Ithaca, N. Y. ■> 



GONIOPHORA RUQOSA. 



Page 297. 

 See Plate 43. 

 Fig. 7. A short, broad right valve of this species. 



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

 Fig. 8a. A short form with a strongly angular and curving umbonal ridge. A right valve of Mierodmi 

 (Cypricardella) hellistriata is on the same block of stone. 

 Hamilton group. lAuUowville, N. Y. 



GONIOPHORA TRUNCATA. 

 Page 298. 

 See Plate 44. 

 Fig. 9. A cardinal view of a right valve. 

 Fig. 10. A left valve showing muscular scars and pallial line. 

 Hamilton group. Pratt's falls, N. Y. 



GONIOPHORA CARINATA. 



Page 301. 

 See Plate 44. 

 Fig. 11. A right valve showing the principal characters of the species in a very satisfactory manner. 

 Hamilton group. Mt. Upton, N. Y. 



GONIOPHORA TRIGONA. 



Page 302. 



See Plate 44. 



Fig. 12. A left valve, redrawn to show more clearly the specific characters than are represented in fig. 9 of 



plate 44. 



Chemung group. Franklin, Delaware Co., N. Y. 



