PLATE IT.* 



Fig. 1. — Streblotrypa striatopora Rogers. 



1. Surface of a branch, X20. (The arrangement of the apertures is a 



little too regular.) 

 Fig. 2. — Polypora elliptiea Rogers. 



2. Portion of obverse, X 27. 



Fig. 3. — Polypora triangularis Rogers. 



3. Obverse surface of a branch, X 27. (Diagonal arrangement of the 



apertures is not so marked.) 

 3a. Portion of the zoarium, X7. 

 36. Part of the reverse, X6. 

 3e. Cross-section of branch, enlarged. 



Fig. 4. — Stenopora. spissa Rogers. 



4. Zoarium, natural size. 

 4a. Surface, X27. 



4&. Cross-section of branch, X13) showing the thickened zoecial walls. 

 Fig. 5. — Stenopora siyimdosa Rogers. 



5. Surface, X 27. 



*The drawings of this plate are semi-diagrammatic. 



