PLATE LIV. 
GYROCERAS patjcinodtjm. 
Page 380. 
Fig. 1. Ventral view, showing the broad, flat, ventral side, and the nodes on the ventro-lateral margins. 
Upper Helderberg limestone. Cherry Valley, N. T. 
Fig. 2. The opposite view of the same specimen, showing the transverse section of the tube and the distance 
between the volutions. 
Fig. 3. Lateral view, showing the number of volutions and the nodes on the ventro-lateral angles. The 
specimen is a cast of the interior. 
Fig. 4. A transverse section of the tube, showing its subtriangular, ovate form, with the broad ventral side. 
Gyroceras tjndulatum. 
Page 378. 
See Plate 53. 
Fig. 5. Lateral view of an imperfect specimen, preserving portions of the test, showing the curvature 
of the tube and the depth of the air-chambers. Upper Helderberg limestone. Cherry 
Valley, N. T. 
