Plate 9 



Page 



1. Hederella varsoviensis, new species 58 



The type zoarium showing branching at considerable intervals, 

 with zooecia of closely arranged, parallel, somewhat contorted 

 tubes. 



Mississippian (Warsaw limestone), Warsaw, 111. 



2. Hederella calvini, new species 51 



The zoarium incrusting a species of Fistulipora and consisting of 

 frequently dividing branches with zooecia closely arranged in 

 4 or 5 rows to a branch. 



Devonian (Cedar Valley formation), Davenport, Iowa. 



3. Hederella romingeri, new species 57 



The type specimen, illustrating such frequent budding and branch- 

 ing that a closely knit mass of tubes results. 



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

 Alpena, Mich. 

 4, 5. Hederella conferta (Hall, 1881) 50 



4, Portion of a colony, X 2.6, incrusting a cephalopod and illustrat- 



ing the characteristic budding at regular intervals from a few 

 tubes into a fan-shaped group. 



5, Portion of the same with rugose surface characters better shown. 

 Hamilton (Ludlowville shale), Canandaigua Lake, N. Y. 



6. Hederella aequidislans, new species 47 



Portion of a zoarium incrusting a cephalopod and illustrating the 



branching at equal distances. 

 Upper Devonian (Tully limestone- West Brook member), 2/2 miles 



south of Sherburne, N. Y. 

 84 



