PLATE XL VI 



PAGE 



Fig. 1. RHOPALONARIA ATTENUATA Ulrich and Bassler 259 



The excavations left by a portion of a colony upon an auloporoid, X 9. 

 Helderberg formation, Keyser member, Cash Valley. 



Fig. 2. ASCODICTYON SILURIENSE Vine 260 



Eight groups of vesicles, X 9, attached to a brachiopod. Helderberg 

 formation, Keyser member, Cash Valley. 



FigS. 3-7. FlSTULIPORELLA MAYNARDI n. Sp 266 



3. A slightly oblique tangential section, X 20, illustrating the struc- 



ture of the outer ridge-like walls on one edge of the drawing 

 and the usual zocecia and mesopores elsewhere. 



4. Tangential section, X 20, through the outermost part of the 



zoarium. 



5. Vertical section, X 20, through two layers of zooacia but not includ- 



ing the outer ridge-like wall in either layer. 



6. Surface view of zooecia, X 9, with crested walls and overarching 



lunaria well developed. 



7. View of another portion of the same specimen, X 9, in which the 



ridge-like outer wall is shown only in one corner. 

 Helderberg formation, Keyser member, Cash Valley. 



Figs. 8-9. STROMATOTRYPA GLOBULARIS n. sp 279 



8. Side view of a zoarium, natural size, showing a portion of the 



wrinkled base. 



9. Surface of zoarium, X 9. 



Helderberg formation, Keyser member, Keyser, W. Va. 



37 



