PLATE XII, 
Fif 
Cyclonema Doris. 
Page 34. 
1. An example of this species from the Schoharie grit, Schoharie, N. Y. 
Pleurotomaria Hebe. 
Page 68. 
Figs. 2-4. Summit, front and basal views of a specimen nearly denuded of shell, but showing the general 
form and to some extent the surface characters. The appearance of a callus covering the 
umbilicus is due to the fracture of the solid part of the columella. 
Figs. 5, 6. The opposite sides of a specimen retaining a portion of the shell and showing surface characters. 
Fig. 7. A larger specimen nearly denuded of shell. 
Pleurotomaria sulcomarginata. 
Page 69. 
Fig. 8. The upper side of a specimen. From the Falls of the Ohio. 
Figs. 9-11. Three views of a specimen of the usual size as known in the Hamilton group of New York, 
retaining the shell and surface characters. 
Fig. 12. Enlargement to two diameters of a small, imperfect specimen, with surface features strongly marked. 
Hamilton group, Pratt’s Falls, N. Y. 
Figs. 13, 14. Two views of a specimen enlarged to two diameters, showing the more distinct surface stria;. 
From the Hamilton group, Delphi, N. Y. 
Fig. 15. A large internal cast referred to this species. Hamilton group at Cumberland, Md. 
Fig. 16. An internal cast. From the Hamilton group near Delphi, N. Y. 
Fig. 17. A small specimen, a partial cast, enlarged to three diameters. From the Hamilton group near 
Delphi, N. Y. 
Pleurotomaria delicatula. 
Page 70. 
Figs. 18, 19. Two views of a specimen with shell, in part, and showing the surface characters. 
Pleurotomaria rotalia. 
Page 71. 
Figs. 20, 21. Two views of a specimen of usual form and size, enlarged to four diametei’s. Fig. 21 shows 
the band on the periphery. 
Fig. 22. The largest individual found, enlarged to three diameters, showing some modifications in the band 
bordei'ing the suture. 
Figs. 23, 24. Basal views of two specimens, showing a slight valuation in the form and size of the callus sur- 
\ rounding the umbilicus. 
Fig. 25. Lateral view of a large internal cast for comparison with the small specimens of P. sulcomarginata 
which are of similar size and condition as in fig. 17. 
