PLATE XIV. 



PAGE. 



Fig. 1. DisciNA (Okbiculoidea) Nevvberryi 277 



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



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



a light buff, fine areiiacious matrix, at Farmiiigtcm, Ohio. 

 Ic. Interior of the under valve, from the dark shales, at Berea, Oliio, 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 jiiece of the Berea shale, showing 



the impression of the ridge of Orbiculoidea, instead of the nsual slit of Diecina. 



Fig. 2. DlKCTNA PLEUEITES 278 



2a. A cast of the upper valve. 

 26. Profile of the same. 



— • 



Fig. 3. LrNGULA melie 27(5 



Apparently the ventral valve. 



Fig. 4. LiNGULA MEMBRANACEA 275 



A view, apparently, of the dorsal valve. 



Fig. 5. Spirifer biplicatus 290 



Dorsal view. 



Fig. 0. Athyris lamellosa , 283 



6rt. A dorsal view of an internal cast. 

 66. Profile of same 



Fig. 7. Spiriper Carteri 285 



la. An anterior view. 

 76. A lateral view. 



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

 the internal tube at (x). 



Fig. 8. Spirifeu striatiformis 289 



8a, Dorsal view of a medium sized specimen, showing cardinal area, etc. 



86. An internal cist of ventral valve. 



8c. An anterior vew of same. 



8d. A part of an external cast of the dorsal valve, showing flue surface markings. 



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



Fig. 9. LiNGULA SCOTICA ? 278 



