Pt^ATE I.r-Continued. 



Pal^oneilo ATTENUATA. 



Paite 34& 

 Fig. 31. A cast of the interior of a left valve. 



Waverly p-oup. lAcHng Co., Ohio. 

 Fig. 35. The interior of a left valve from a gutta-percha impi-es,sion of the preceding. 

 Fig. 36. An enlargement of the same. 

 Fig. 37. A small individual of this species. 



Waverly group. Newark, Ohio. 

 Fig. 38. The cast of a right valve of medium size. 



Waverly grouj). Newark, Ohio. 

 Pig. 39. A cast of an unusually large left valve. 



Waverly group. Newark, Ohio. 



Paljeoneilo TRUNCATA. 



Page HI. 

 Fig. 40. A small specimen retaining the shell and showing the surface markings. 



Waverly g^-oup Bagdad, Ohio. 

 Pig. 41. A lai-ge right valve of this species. 



Pal^eoneilo SULCATINA. 



Page 347. 

 Fig. 42. A left valve. 



Waverly group. Licking Co., Ohio. 

 Fig. 43. A cast from the impres.sion of the exterior, showing the character of surface strise and an unusual 

 truncation at the post-inferior exti-emity. 



Waverly group. Newark, Ohio. 

 Fig. 44. From a gutta-percha impression of the natural mould. , , , li 



Waverly group. Licking Co., Ohio. 

 Fig. 45. A cast of the interior of a right valve, showing muscular scars and crenulated hinge-line. 



Waverly gi"oup. Licking Co., Ohio. 

 Fig. 46. A gntta-pereha impression from a right valve of this species. 



Waverly group.jj \Richfield, Ohio. 



