Plate 8 



Page 

 1, 2. Hederella regularis, new species 33 



1, The type specimen, a large zoarium incrusting a Cystiphyllum., 



with the background in the lower half blackened to bring out 

 the regular branching and budding of the zooecia. 



2, Small portion of same, X 8. 



Hamilton (Widder shale), Thedford, Ontario. 



3. Hederella helderbergia, new species 45 



The type specimen, consisting of robust, regularly branching zoo- 

 ecia incrusting a brachiopod shell. 



Lower Devonian (Helderbergian-New Scotland limestone), Scho- 

 harie County, N. Y. 



4. Hederella major, new species 53 



Vfew of zoarium showing the very large tubes in close contact and 



the method of branching. 

 Hamilton (Widder shale), Thedford, Ontario. 

 5-8. Hederella contortilis, new species 39 



5, Fragmentary zoarium not complicated by excessive branching. 



6, Colony with more complex arrangement of the branches. 



7, Colony with the zooecial tubes almost forming a mat. 



8, Initial portion of a colony with the specific characters obscured 



by the tangle of tubes. 

 Onondaga (Upper JefFersonville limestone). Falls of the Ohio. 



83 



