PLATE XXXIV. 
Goniophora perangulata. 
Pago 293. 
See Plate 42. 
Figs. 1, 2. Two left valves, showing the general characters of the species. 
Fig. 3. A small right valve. 
Figs. 4-6. Right, anterior and cardinal views of a specimen preserving both valves. 
Schoharie grit. Schoharie, N. Y. 
Goniophora ? alata. 
Page 294. 
See Plate 42. 
Fig. 7. An imperfect right valve. 
Schoharie grit. Schoharie, N. Y. 
Nyassa elliptic a. 
Page 357. 
Fig-. 8. A rig-ht valve with the shell almost entirely removed, showing the muscular scars and hinge-line 
as preserved on the cast of the interior. 
Corniferous limestone. /{Stafford, N. Y. 
Modiomorpha CONCENTRICA. 
Page 275. 
See Plates 35, 36. 
Fig. 9. The right side of a small specimen. 
Fig. 10. A large specimen showing the anterior muscular scar and pallial line. 
Hamilton group. Near Louisville, Ky. 
MODIOMORPHA ? PONDEROSA. 
Page 271. 
See Plate 35. 
Fig. 11. A cardinal view of the specimen, with the rig-ht valve partially worn away. 
Fig. 12. The left side of the same specimen. See plate 35, fig. 8, for another figure of the same. 
Corniferous limestone. Clarence Hollow, N. Y. 
Modiomorpiia Schoharie. 
Page 269. 
See Plate 35. 
Fig. 13. The right side of a cast showing muscular scars and pallial line. 
Schoharie grit. Schoharie, N. Y. 
Modiomorpha complanata. 
Page 272. 
See Plate 41. 
Fig. 14. A cast of a left valve showing muscular impressions and pallial line. 
Corniferous limestone. Near Delaware, Ohio. 
Modiomorpha linguiformis. 
Page 274. 
Fig. 15. The rig-ht side of the cast preserving a portion of the thickened shell, referred with some doubt to 
this species. 
Fig. 16. A cardinal view of a cast of the interior of another specimen. 
Fig. 17. The right side of the preceding. 
Corniferous limestone. Columbus, 0. 
