PLATE CXI.— Continued. 
Fig. 9. Upper lateral view of a fragment, showing the curvature of the tube and the depth of the air- 
chambers. The obscure furrows of the crenulations at the base of the chamber of habitation 
are not represented. Schoharie grit. Schoharie, N. Y. 
Fig. 10. Ventral view of an individual, showing the evident departure from asymmetrical curvature, and 
the large siphuncle exposed in the process of weathering. Schoharie grit. Schohane, N. Y. 
Cyrtoceras metula. 
Page 360. 
See Plate 47. 
Fig. 11. Lateral view of an individual preserving the chamber of habitation with twenty-seven attached air- 
chambers, showing the form and curvature of the tube, the size of the grand chamber, and the 
depth of the air-chambers. The obscure furrows of the crenulations are shown over a portion 
of the internal mould of the walls of the air-chambers. Upper Helderberg limestone. Little- 
ville, iV. Y. 
