154

Plate III

Fig. 1.-Rhynchotreta insinuata, n. sp. Ventral view of the holotype.

Fig. 2.-Anterior view of the same.

Fig. 3.-Wilsonia wadei, n. sp. Ventral view.

sp.

Fig. 4. Anterior view of the same.
Fig. 5.-Uncinulus lindenensis, n. sp.
Fig. 6.-Uncinulus lindenensis, n.
Fig. 7.-Eatonia fissicosta, n. sp.
Fig. 8.-Eatonia fissicosta, n. sp.
Fig. 9.-Eatonia tennesseensis, n. sp.
Fig. 10.-Eatonia tennesseensis, n. sp.

Dorsal view.

Anterior view.
Lateral view.
Ventral view.

Interior of the ventral valve.
Ventral view of a typical speci-

men, faintly showing the low plications at the anterior margin. Fig. 11.-Eatonia tennesseensis, n. sp. Dorsal view of a very large specimen, with unusually coarse striations.

Fig. 12.-Gypidula multicostata, n. sp. Interior view of the umbonal por-
tion of a ventral valve, showing the small spondylium.
Fig. 13.—Gypidula multicostata, n. sp. Ventral view, to show the numer-
ous narrow plications.

Fig. 14.-Megalanteris (?) saffordi, n. sp. Ventral view of a wax cast
from a natural mold. The margin is incomplete.

Fig. 15. 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. 16.—Oriskania condoni (McChesney). The loop of this species.
Fig. 17.-The cardinal process of the same species, to show the median
vertical ridge.

Fig. 18.-Leptostrophia beckii tennesseensis, n. var. View of an incom-
plete ventral valve, showing the characteristic wavy or
dimpled surface.

156

Plate IV

Fig. 1.-Delthyris cyrtinoides, n. sp. Ventral view of a typical specimen.
Fig. 2.-Lateral view of the same.

Fig. 3.-Inside view of the ventral beak of the same species, showing
the convergence of the dental lamellæ and their union with
the median septum.

Fig. 4-Trematospira bella, n. sp. Lateral view of the holotype.
Fig. 5.-Cardinal view of the same.

Lateral view.
Dorsal view.

Lateral view.
Ventral view.

Fig. 6.-Trematospira costata angusta, n. var.
Fig. 7.-Trematospira costata angusta, n. var.
Fig. 8.-Delthyris octocostata tennesseensis, n. mut.
Fig. 9.-Delthyris octocostata tennesseensis, n. mut.
Fig. 10.-Distemnostoma curtum, n. gen., n. sp. Lateral view of the holo-
type. The line bounding the basal channel may be seen near
the base.

Fig. 11.-Apical view of the same specimen.

Fig. 12. Sketch of the preceding view, to show the course of the growth-line and the slit-band.

Fig. 13.-Holopea planidorsata, n. sp.

Fig. 14-Aulopca nelsoni, n. gen., n. sp. Lateral view, from the apertural side, x 8/7.

Fig. 15.-Aulopea nelsoni, n. gen., n. sp. View from the opposite side, showing the deep compressed form of the whorls.

Fig. 16. Sketch of the basal view of the same specimen, showing the channel at the base of the aperture.

Fig. 17.-Saffordella tennesseensis, n. gen., n. sp. Side view, to show the growth-lines and the broad slit-band.

Fig. 18.-Distemnostoma princeps, n. gen., n. sp. View of the upper surface of a broken whorl, showing the character of the slitband.

Fig. 19.-Distemnostoma princeps, n. gen., n. sp. Lateral view of one of the types.

Fig. 20.-Diaphorostoma quadrangulare, n. sp. View from the apertural side, x 10/9.

Fig. 21.-Diaphorostoma quadrangulare, n. sp. View from the opposite

side.