PLATE CL 
Gyroceras Cyclops. 
Page 387. 
See Plates 102, 103, 104. 
Lateral view of an individual imperfect at the apex, showing the size and curvature of the tube, with the 
transverse annulations on the internal mould corresponding to the ornaments of the test. A slight expan¬ 
sion of the tube is shown at the aperture, and on the ventral side of the apical portion the revolving 
ridges formed by the plications of the foliate expansions of the test. Upper Helderberg limestone. 
Clarksville, JV. F. 
