Plate III 



-Rhynchotrcta insinuata, n. sp. Ventral view of the holotype. 



-Anterior view of the same. 



-Wilsonia wadci, n. sp. Ventral view. 



-Anterior view of the same. 



-Uncinulus lindenensis, n. sp. Dorsal view. 



-Uncinulus lindenensis, n. sp. Anterior view. 



-Eatonia fissicosta, n. sp. Lateral view. 



-Eatoiiia fissicosta, n. sp. Ventral view. 



-Eatonia tennesseensis, n. sp. Interior of the ventral valve. 



-Eatonia tennesseensis, n. sp. Ventral view of a typical speci- 

 men, faintly showing the low plications at the anterior margin. 



-Eatonia tennesseensis, n. sp. Dorsal view of a very large speci- 

 men, with unusually coarse striations. 



-Gypidiila multicostata, n. sp. Interior view of the umbonal por- 

 tion of a ventral valve, showing the small spondylium. 



-Gypidula multicostata, n. sp. Ventral view, to show the numer- 

 ous narrow plications. 



-Megalanteris (?) saffordi, n. sp. Ventral view of a wax cast 

 from a natural mold. The margin is incomplete. 



-The loop of the same species. The anterior margin is possibly 



incomplete because of breakage before fossilization. This 



seems improbable, however, since two specimens preserving 



the loop agree in shape. 



Fig. 1 6. — Oriskania condoni (McChesney). The loop of this species. 



Fig. 17. — The cardinal process of the same species, to show the median 



vertical ridge. 

 Fig. iS. — Leptostrophia bcckii tennesseensis, n. var. View of an incom- 

 plete ventral valve, showing the characteristic wavy or 

 dimpled surface. 



I 



