PLATE XLVIII 



PAGE 



Figs. 1-3. DIPLOSTENOPORA siLURiANA (Weller) 277 



1. An incomplete zoarium of average size, X 1.5, with low monticules. 



2. A more robust incomplete, smooth zoarium, X 1.5. 



3. Surface of specimen shown in fig. 1, X 9. 



Helderberg formation, Keyser member, Cash Valley. 



Fig. 4. FlSTULIPORELLA MARYLANDICA n. Sp 266 



Surface of a zoarium, X 6, exhibiting the well-marked solid maculae. 

 Helderberg formation, Keyser member, Cash Valley. 



Fig. 5. BATOSTOMELLA INTERPOROSA n. sp 270 



One of the type specimens, X 5. Helderberg formation, Keyser 

 member, Devil's Backbone. 



Fig. 6. ORTHOPORA RHOMBIFERA Hall 286 



Surface of a slab, X 5, showing numerous fragments of this species. 

 Helderberg formation, Keyser member, Cash Valley. 



Figs. 7, 8. PTILODICTYA TENELLA n. sp 288 



7. Incomplete specimen, X 5. 



8. Surface of same, X 9. 



Helderberg formation, Keyser member, Devil's Backbone. 



