Foerste.] 
352 
[May 1, 
EXPLANATION OE PLATES. 
C. T., at the close of each reference, signifies- that the fossils figured 
were collected at Cumberland Gap, Tenn. ; C. A., at Collinsville, Alabama; 
H. I., at Hanover, Indiana; S. O., at Soldier’s Home near Dayton, Ohio; 
B. 0., at Brown’s Quarry near New Carlisle, Ohio; E. 0., at Eaton, 0. 
PLATE Y. 
Eigs. 1-4. StricJclandinia lens, Sowerby. Eigs. 1, 3, 4, casts of ventral 
valves; fig. 2, cast of dorsal valve; fig. 2 a , reconstructed interior of 
the dorsal valve. C. A. 
Fig. 5. Spirifera ( Cyrtia ) rostellum, Hall. Cast of ventral valve and a 
line indicating its convexity. C. A. 
Fig. 6. Spirifera plicatella var. radiata, Sowerby, dorsal valve. C. T. 
Fig. 7. Cornulites distans, Hall. C. A. 
Fig. 8. Cornulites serpularius var. Clintoni, Hall. C. A. 
Fig. 9. Leptoena transfer salis, var. Alabamensis, Foerste. Cast of ven 
tral valve, and a line indicating its convexity. C. A. 
Figs. 10-12. Euomplialus sinuatus. Hall. Fig. 10, view of the spire- 
the spire conjecturally completed from the curvature of the fragment, 
found; fig. 11, an entirely conjectural figure of a side view based on the 
slight elevation of the spire indicated by the fragment found, but serving 
to indicate the actual position of the sinus at a ; a is a view of the sinus, 
the position of which is indicated in figs. 10 and 11 ; fig. 12, a view of a 
part of the fragment found, from the umbilical side. C. A. 
Fig. 13. Leptoena transversalis , var . prolong ata, Foerste. Yentral valve 
and a line indicating the convexity of the same. Wildwood station, 
Georgia. 
Fig. 14. Pleurotomaria labrosa var. occidens, Hall. C. A. 
Fig. 15. Cyclonema bilix, Conrad. B. O. 
Fig. 16. Conularia Niagarensis, Hall. Todd’s Fork, Ohio. 
Figs. 17, 18. Pentamerus ovalis. Hall. Fig. 17, a finely preserved cast 
of a dorsal valve; fig. 18, a cast of a ventral valve. C. A. 
Fig. 19. Pterinea. C. A. 
Fig. 20. lllcenus, perhaps J. loxus, Hall. Fragment of a glabella, pos- 
sible outlines indicated. C. A. 
Fig. 21. Holopella 9 cf. Loxonema subulata, Conrad. The strias partly 
preserved on the last coil. Todd’s Fork, Ohio. 
Fig. 22. Strophomena patenta, Hall. Fragment, dorsal valve, its orig- 
inal outlines restored. C. A. 
Figs. 23, 24. Bliynchonella Janea , Billings. Fig. 23 a, inner cast of a 
dorsal valve; 23 6, inner cast of a ventral valve; fig. 24, side view of an 
inner cast. 
Fig. 25. Orthoeeras Nova Carlislensis, Foerste. A section of the siphon. 
Fig. 26. Orthoeeras Crawfordi , Foerste. A vertical section showing the 
siphon. 
