PLATK LXXIX— Continucil. 



CYPKICARniNIA CONSIMILI8. 

 Page ««. 

 See Plate 96. 

 Fig. 18. A right valve presei-ving a i>ortion of the test with the surface markings and showing the posterior 

 muscular scar, enlarged to two dianieters. Referred to this species with doubt. 

 Waverly group. HkhJUld, Summit Co., Ohio. 

 Pigs. 19-21. Left, right an<l cai-dinal views of a cast of the interior. 

 Waverly group. ZActnng Co., Ohio. 



Cypkicakdinia sulciferus. 



Pago 487. 

 Fig. 23. A partial cast of the interior of a right valve, enlarged to three diameters. 

 Yellow sandstone. Burlington, Imoa. 



CyPRICARDINIA ? CYLINDRICA. 

 Page 486. 

 Figs. 24, 25. Left side and cardinal views of the original specimen. 

 Hamilton group. Near Louisville, Ky. 



PAL.SANATINA TYPA. 

 Page 188. 

 Figs. 26, 27. Two left valves of the ordinary form. 



Chemung gi-oup. Portville, N. T. 

 Figs. 28, 35. Two right valves, showing their deju-essed form. 



Chemung group. Portville, N. T. 

 Figs. 36, 37. Two left valves with the cincture less developed than in figs. 26 and 27. 

 Chemung group. Portville, N. T. 



Pal^anatina ANGUSTA. 



Page 4»0. 

 Figs. 29, 30. Two right valves. 



Chemung group. Near Portville, N. T. 

 Figs. 31-34. Four left valves showing some variations in form and proporUons. 



Chemung group. Near Portville, N. T. '^'- •^"'"» "^'^«"" 



PaL^ANATINA SOLENOIDE8. 



Page 489. 

 Figs 38 39 Left and right side of a specimen retaining both valves, showing the form and surface 

 characters. . i ,^. .,v,,«:,-V,u«/v .-i.;...,, ^w.msdU 



Chemung group. Near PortvUle, N. T. 



Prorhynchus quadratum. 



Page 492. 

 See Plate 96. 

 Ftga. 40-49. A series of valves showing considerable variation in size and form. 

 Chemung group. Near Smelhport, Pa. 



