TABLE OF CONTENTS. 

 | PAGE 



2. From the Winchester group 43 



Eridotrypa briareus (Nicholson) 43 



Peronopora miller! n. sp 43 



Constellaria emaciata Ulrich and Bassler 44 



Homotrypella norwoodi n. sp 45 



Heterotrypa parvulipora Ulrich and Bassler 45 



3. From the Eden group 46 



Peronopora vera Ulrich ; 46 



Amplexopora persimilis n. sp ' 47 



Dekayella ulrichi (Nicholson) 47 



Heterotrypa foerstei n. sp 48 



Batostoma implicatum (Nicholson) 48 



Crepipora venusta (Ulrich) 49 



Callopora nodulosa (Nicholson) 50 



Callopora sigillarioides (Nicholson) 50 



4. From the Mount Hope beds 51 



Heterotrypa subpulchella (Nicholson) 51 



Batostoma maysvillensis n. sp 51 



Constellaria prominens Ulrich 52 



Amplexopora septosa (Ulrich) 52 



5. From the Fairmount beds 53 



Escharopora hilli (James) 53 



Dekayia aspera Edwards and Haime 51 



Constellaria florida Ulrich 54 



Amplexopora cingulata Ulrich 55 



Monticulipora mammulata D'Orbigny 56 



6. From the Arnheim beds 57 



Batostoma varians (James) 57 



7. From the Richmond group 57 



Prasopora hospitalis (Nicholson) 57 



Rhombotrypa quadrata (Rominger) 58 



Plates and explanations 59 



