Plate IV 



Fig. i.^DcIfhyris cyrt in aides, n. sp. Ventral view of a typical specimen. 



Fig. 2. — Lateral view of the same. 



Pig, 3, — Inside view of the ventral beak of the same species, showing 

 the convergence of the dental lamell^e and their union with 

 the median septum. 



Fig. 4. — Trcinatospira bclla, n. sp. Lateral view of the holotype. 



Fig. 5. — Cardinal view of the same. 



Fig. 6. — Trematospira costafa aiigtista, n. var. Lateral view. 



Fig. 7. — Trematospira costata angusta, n. var. Dorsal view. 



Fig. S.—Delthyris oetocostata fennesseensis, n. mut. Lateral view. 



Fig. 9. — Delihyris oetocostata tcnnesseensis, n. mut. Ventral view. 



Fig. 10. — Distemnostoma eurtum, n. gen., n. sp. Lateral view of the holo- 

 type. The line bounding the basal channel may be seen near 

 the base. 



Fig. II. — 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. — Holopca planidorsata, n. sp. 



Fig. 14. — Aulopca nelsoni, n. gen., n. sp. 

 tural side, x8/7. 



Fig. 15. — A III pea nelsoni, n. gen., n. sp. 



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 tcnnesseensis, 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 sur- 

 face of a broken whorl, showing the character of the slit- 

 band. 



Fig. 19. — Distemnostoma princeps, n. gen., n. sp. Lateral view of one of 

 the types. 



Fig. 20. — Diaphorostoma quadrangnlare . n. sp. View from the apertural 

 side, X 10/9. 



Fig. 21. — Diapliorostoma (luadrangulare, n. sp. \^iew from the opposite 

 side. 



Lateral view, from the aper- 

 View from the opposite side. 



