Plate 15 



Page 



1 . Ilernodia tennesseensis, new species 65 



Gutta-percha impression of the type specimen represented by 

 an excavation in the base of a massive bryozoan (Monotrypa) . 



Lower Devonian (Helderbergian-Birdsong shale), Swaynes Mills, 

 Benton County, Tenn. 



2. Hederella concinna, new species (see also pi. 7, figs. 10-15) 32 



A portion of the delicate zoarium incrusting a brachiopod. 

 Middle Devonian (Onondaga-Columbus limestone), Sandusky, 

 Ohio. 



3. Hernodia (?) monahani, new species 67 



Gutta-percha squeeze of a part of the type preserved as a mold in a 



cephalopod. 

 Silurian (Cayugan-Bertie limestone), near Buffalo, N. Y. 



4. Hernodia {? Hederella) compacta, new species 68 



Small portion of the zoarium incrusting a brachiopod large enough 



to show the very compact arrangement of the zooecia. 

 Middle Devonian (Onondaga-Columbus limestone) , Sandusky, Ohio. 

 5, 6. Hernodia humifusa Hall, 1881 64 



5, Natural cast of a specimen with the large dimensions and other 



characters of the type. 

 Devonian (Milwaukee limestone-Lindwurm member), Milwaukee, 

 Wis. 



6, Portion of the original type, X 2 (after Hall). 

 Middle Devonian (Ludlowville shale), Cazenovia, N. Y. 



7. Hernodia cornucopia, new species 65 



The type specimen resembling the genotype but differing in the 

 closer arrangement and greater breadth of the tubes. 



Middle Devonian (Traverse-Genshaw formation). Long Lake, near 

 Alpena, Mich. 



8. Hernodia ulrichi, new species 65 



View of the type preserved in porous chert showing the short, rapidly 



expanding separated zooecia. 

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



9. Hernodia davisi, new species 66 



Portion of the type incrusting a brachiopod showing the wide 



spacing of the zooecial tubes. 

 Hamilton (Silver Creek dolomite), Falls of the Ohio. 

 90 



