14 
Explanation of Plate II. 
Cryptophragmus antiquatus Raymond. 
Figures 1 and 2. Transverse and longitudinal thin sections of a specimen, en- 
larged 4 diameters. Note the inner tube with its convex partitions 
and wall of vesicular tissue, the alternation of well preserved 
and lime- filled zones, and the radial tubes. For other sections 
of this same specimen, see Plate III, figures 4 and 5. 
