Plate 5 



Page 



1-3. Hederella alternata (Hall and Whitfield, 1873) 36 



1, A small complete zoarium incrusting a Spirifer and showing 



the ancestrula, the method of branching, and the regular 

 alternate budding of the zooecia. 



2, More mature portion of another zoarium with branching and 



budding plan quite visible. 



3, A slightly abraded e.xample. 



Devonian (Hackberry-Cerro Gordo shale), Rockford, Iowa. 

 4, .5. Hederella halyson (Fenton and Fenton, 1924) (see also pi. 2, fig. 6, 



and pi. 12, fig. 1) 48 



4, Incomplete small zoarium incrusting a Spirifer. 



5, A small colony illustrating the budding of the short tube 



directly from the short preceding one. 

 Devonian (Hackberry-Cerro Gordo shale), Rockford, Iowa. 

 6, 7. Hederella linearis (Fenton and Fenton, 1924) 37 



6, A zoarium incrusting a Spirifer and showing the similar angle 



of branching and budding. 



7, Portion of a colony illustrating the short but rather wide 



zooecial tube. 

 Devonian (Hackberry-Cerro Gordo shale), Rockford, Iowa. 



8. Hederella lonisvillensis, new species 57 



A colony incrusting the interior of a brachiopod shell, illustrating 

 similarity to H. hilineata but differing in the larger size of 

 the zooecia. 

 Onondaga (Upi)er Jeffersonville limestone). Falls of the Ohio. 

 9-11. Hederella bilineata, new species 56 



9, Zoarium with ancestrula incrusting a brachiopod; the small 



bilinearly arranged zooecia and the regular branching of the 

 zoarium are evident. 

 Hamilton ( Ludlow ville-Centerfield shale), 3 miles west of East 

 Bethany, N. Y. 



10, 11, Two portions of a zoarium incrusting a cup coral; the 

 zoarial branching is at greater intervals than in the preced- 

 ing, owing perhaps to the rough surface. 



Hamihon (Ludlowville shale), York, N. Y. 



1 2. Hederella cotisimilis, new species _ 57 



The type specimen incrusting the interior of a brachiopod, show- 

 ing similarity to H. bilineata but with slightly longer and 

 narrower zooecia. 



Onondaga (Upper Jeffersonville limestone), Falls of the Ohio. 



13. Hederella coynpacta, new species 56 



Zoarium incrusting a crinoid column; the closely spaced branches 

 of short, wide, compactly arranged zooecia are evident. 



Middle Devonian (Traverse-Partridge Point formation). Par- 

 tridge Point, 3 miles south of Alpena, Mich. 

 80 



