PLATE LIV. 



Gtroceras pauoinodum. 



Page 380. 

 Fig. 1. Ventral view, showing the broad, flat, ventral sifie, and the nodes on the ventro-lateral margins. 



Upper Helderberg limestone. Cherry Valley, N. Y. 

 Fig. 2. The opposite \'iew 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 tmnsvei-se section of the tube, showing its subtriangnlar, ovate form, with the broad ventral side. 



Gteooerab undulatum. 



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. Clierry 

 VaUey, N. T. 



