PLATE LXXIX—Continued. 
Cypricardinia consimilis. 
Page 486. 
See Plate 96. 
Fig. 18. A right valve preserving a portion of the test with the surface markings and showing the posterior 
muscular scar, enlarged to two diameters. Referred to this species with doubt. 
Waverly group. Richfield, Summit Co., Ohio. 
Figs. 19-21. Left, right and cardinal views of a cast of the interior. 
Waverly group. Licking Co., Ohio. 
Cypricardinia sulciferus. 
Page 487. 
Fig. 22. A partial cast of the interior of a right valve, enlarged to three diameters. 
Yellow sandstone. Burlington, Iowa. 
Cypricardinia ? cylindrica. 
Page 486. 
Figs. 24, 25. Left side and cardinal views of the original specimen. 
Hamilton group. Near Louisville, Ky. 
PALA5ANATINA typa. 
Page 488. 
Figs. 26, 27. Two left valves of the ordinary form. 
Chemung group. Portville, N. Y. 
Figs. 28, 35. Two right valves, showing- their depressed form. 
Chemung group. Portville, N. Y. 
Figs. 36, 37. Two left valves with the cincture less developed than in figs. 26 and 27. 
Chemung- group. Portville, N. Y. 
Palaeanatina angusta. 
Page 490. 
Figs. 29, 30. Two right valves. 
Chemung group. Near Portville, N. Y. 
Figs. 31-34. Four left valves showing some variations in form and proportions. 
Chemung group. Near Portville, N. Y. 
Pal^anatina solenoides. 
Page 489. 
Figs. 38, 39. Left and right side of a specimen retaining both valves, showing the form and surface 
characters. 
Chemung group. Near Portville, N. Y. 
Prorhynchus quadratum. 
Page 492. 
See Plate 96. 
Figs. 40-49. A series of valves showing considerable variation in size and form. 
Chemung group. Near Smeth'port, Pa. 
