I 
PLATE C. 
GyROCERAS VAT.iDrM. 
Page 385. 
See Plate 49. 
Fig. 1. Lateral view of an individual preserving nearly its natural form ; showing the curvature and enlarge¬ 
ment of the tube, and the gradual increase in the depth of the air-chambers, from the apex 
toward the grand chamber. The direction of the chamber of habitation is outward from the 
spiral in a direction tangent to the curve. At the aperture the tube is slightly expanded. 
Schoharie grit. Albany county, N. Y. 
