I'l.ATK 20. 



Fios. 1-3. Ceriopnra rirf/iniana, new species, (p, 193.) 



1. The irregular globular zoariuni, natural size. 



2. Surface, X 12, showing the thiu walls of the polygonal zooecia. 



3. Portion of the same, X 2'). 



Miocene ( Yorktown forraationi: One mile northeast of Suffolk, Virginia. 

 Figs. 4-0. Atdesopora reptans. new species, (p. 194.) 



4. Zoaria, natural size, incrusting a shell. 



5. A complete zoarium, X 12, with the zone of growth showing small lobes, 

 fi. A narrow flabellate zoariuni, X 12, with a thick zone of growth. 



Miocene (Duplin marl): Mulilrows Mills, 5 miles south of Mayville, Sumter County, South Caro- 

 lina. 

 Fi(i. 7. Prohoscina nuslerl, new species, (p. 193.) 



The type specimen, X 12, showing the long branches with three rows of zooecia. 



Miocene (Duplin marl): Wilmington, North Carolina. 

 Fig. 8. Idmoneai'!] e.vpansa Ulrich and Bassler, 1904, (p. 200.) 



The irregular, flabellate, incrusting zoarium, X 12. 



Miocene (St. Mary's formation): Cove Point, Maryland. 

 Figs. 9-12. Theonna glomerata Ulrich and Bassler, 1904. (p. 201.) 



9, 10. A large specimen, natural size, and a photograph, X 4. 



11. A small specimen, natural size. 



12. Another view of the same, X 4. 



Figs. 13-15. Irhiionea planula, new species, (p. 199.) 



13. The free zoarium, natural size. 



14. Anterior side, X 12, showing the salient fascicles closely arranged and opposite to each other. 



15. Posterior side of the same specimen, X 12, illustrating the flat, transversely striated dorsal. 

 Jfiocene (('hoctawhatchee marl): .Jackson Rluff, Ocklocknee River, 25 miles southwest of Talla- 

 hassee, Florida. 



270 



