PLATE XVIII 



PAGE 



Figs. 1, 2. STREPTELASMA CUMBEELANDICA Swartz n. sp 199 



1. Exterior of weathered corallum. 



2. Longitudinal section of same individual. 



Helderberg formation, near Cumberland. 



Figs. 3-7. ZAPHRENTIS RCEMERI M. Edwards and Haime 200 



3. Side view of corallum, questionably referred to this species. Oris- 



kany formation, Ridgely member, Cumberland. 



4. Side view of corallum. 



5. 6. Transverse sections of corallum. 

 7. Longitudinal section of corallum. 



New Scotland formation, New York. 



