PLATE XIV. 



PAGE. 



Fig. 1. DisciNA (Orbiculoidea) Neu'berryi 277 



la. A cast of the exterior of a full sized specimen, from shales at Berea, Ohio. 



16. A cast of a somewhat smaller individual, same valve, apparently of the same species, from 



a light buff, fine arenacious matrix, at Famiington, Ohio. 

 Ic. Interior of the under valve, from the dark shales, at Berea, Ohio, showing merely a raised 



ridge on the inner side instead of a slit. 

 Id. Impression of the inner side of the under valve, in a pieco of the Berea shale, showing 



the improsaion of the ridge of Orbiculoidea, instead of the nsual slit of Discina. 



Fig. 2. Discina pleurites 278 



2a. A cast of the upper valve. 

 26. Profile of the same. 



Fig. 3. LiNGULA MELIE 276 



Apparently the ventral valve. 



Fig. 4. LiNGULA MEMBRANACEA 275 



A view, apparently, of the dorsal valve. 



Fig. 5. Spirifer biplicatus 290 



Dorsal view. 



Fig. 6. AtHYRIS LAMELLOSA <- 283 



Ga. A dorsal view of an internal cast. 

 66. Profile of same. 



Fig. 7- Spirifeb Carteri 285 



7a. An anterior view. 

 76. A lateral view. 



7c. A view of the posterior or hinge side, cardinal area, etc., with some remains of the cast of 

 the internal tube at (x). 



Fig. 8. Spirifer striatiformis 289 



8a, Dorsal view of a medium sized spjscimen. showing cardipal area, etc. 



86. An internal cast of ventral valve. 



8c. An anterior ve w of same. 



dd. A part of an external cast of the dorsal valve, showing fine surface markings. 



8e. A portion of the surface magnified, to show minute transverse and longitudinal lines. 



Fig. 9. LiNGULA SCOTICA ? 27(i 



