E. H. Sellards. 
176 
from the dividing up of an original disk. The free tips of the 
segments occasionally stand open, thus retaining in part their 
original shape, owing probably to their having been quickly buried 
in sediment. The average specimens of Codonothcca cadnca measure 
3 to 5 centimeters from base to tip. The width of the top is about 
centimeters. The segments above the point where they become 
Codonotlieca cadnca, Sellards. 
1 2 3 4 5 
Text-Fig. 7. 
1. The fleshy covering lias disappeared by maceration from the base of 
this specimen, allowing the resistant area at the centre, which 
still retains its shape, to stand out prominently. Strands I., II., 
III. and VI., are visible, IV. and V. being hidden on the opposite 
side. Twice natural size. 
2 and 3. Figures two and three illustrate the two sides of a single 
specimen. The very numerous large spores lie in a depressed 
channel along the inner side of the segments from the tip to the 
base. The cavity formed by the united bases of the segments 
ends at C. Natural size. 
4. Specimen showing the fleshy base flattened and with the vascular 
cone at the centre. Natural size. 
5. Plan of structure of the spore-bearing organ. The organ is represented 
as cut down the middle and laid open, the cut passing between 
the segments, hence in the basal part through one of the main 
strands. The end of the cavity is marked at C. Natural size. 
6. Group of spores imbedded in a deposit of sphalerite, and with the 
surface ornamentation consequently well preserved. Enlarged 
28 times linear. 
7. Section through the spore wall, showing the thick outer, and a thin 
compact inner layer. Enlarged 200 times linear. 
8. A single spore showing the slit as commonly observed. Enlarged 
84 times linear. Author’s illustrations, 
